Documentation/v2: 'etcd v2' to the title

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

Documentation/v2/04_to_2_snapshot_migration.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Snapshot Migration
 
 You can migrate a snapshot of your data from a v0.4.9+ cluster into a new etcd 2.2 cluster using a snapshot migration. After snapshot migration, the etcd indexes of your data will change. Many etcd applications rely on these indexes to behave correctly. This operation should only be done while all etcd applications are stopped.

Documentation/v2/README.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # etcd2
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/coreos/etcd)](https://goreportcard.com/report/github.com/coreos/etcd)

Documentation/v2/admin_guide.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Administration
 
 ## Data Directory

Documentation/v2/api.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # etcd API
 
 ## Running a Single Machine Cluster

Documentation/v2/api_v3.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # etcd3 API
 
 TODO: API doc

Documentation/v2/auth_api.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # v2 Auth and Security
 
 ## etcd Resources

Documentation/v2/authentication.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Authentication Guide
 
 ## Overview

Documentation/v2/backward_compatibility.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Backward Compatibility
 
 The main goal of etcd 2.0 release is to improve cluster safety around bootstrapping and dynamic reconfiguration. To do this, we deprecated the old error-prone APIs and provide a new set of APIs.

Documentation/v2/benchmarks/README.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # Benchmarks
 
 etcd benchmarks will be published regularly and tracked for each release below:

Documentation/v2/benchmarks/etcd-2-1-0-alpha-benchmarks.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 ## Physical machines
 
 GCE n1-highcpu-2 machine type

Documentation/v2/benchmarks/etcd-2-2-0-benchmarks.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # Benchmarking etcd v2.2.0
 
 ## Physical Machines

Documentation/v2/benchmarks/etcd-2-2-0-rc-benchmarks.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 ## Physical machines
 
 GCE n1-highcpu-2 machine type

Documentation/v2/benchmarks/etcd-2-2-0-rc-memory-benchmarks.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 ## Physical machine
 
 GCE n1-standard-2 machine type

Documentation/v2/benchmarks/etcd-3-demo-benchmarks.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 ## Physical machines
 
 GCE n1-highcpu-2 machine type

Documentation/v2/benchmarks/etcd-3-watch-memory-benchmark.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # Watch Memory Usage Benchmark
 
 *NOTE*: The watch features are under active development, and their memory usage may change as that development progresses. We do not expect it to significantly increase beyond the figures stated below.

Documentation/v2/benchmarks/etcd-storage-memory-benchmark.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # Storage Memory Usage Benchmark
 
 <!---todo: link storage to storage design doc-->

Documentation/v2/branch_management.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Branch Management
 
 ## Guide

Documentation/v2/clustering.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Clustering Guide
 
 ## Overview

Documentation/v2/configuration.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Configuration Flags
 
 etcd is configurable through command-line flags and environment variables. Options set on the command line take precedence over those from the environment.

Documentation/v2/dev/release.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # etcd release guide
 
 The guide talks about how to release a new version of etcd.

Documentation/v2/discovery_protocol.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Discovery Service Protocol
 
 Discovery service protocol helps new etcd member to discover all other members in cluster bootstrap phase using a shared discovery URL.

Documentation/v2/docker_guide.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Running etcd under Docker
 
 The following guide will show you how to run etcd under Docker using the [static bootstrap process](clustering.md#static).

Documentation/v2/errorcode.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Error Code
 ======
 

Documentation/v2/faq.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # FAQ
 
 ## 1) Why can an etcd client read an old version of data when a majority of the etcd cluster members are down?

Documentation/v2/glossary.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Glossary
 
 This document defines the various terms used in etcd documentation, command line and source code.

Documentation/v2/implementation-faq.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # FAQ
 
 ## Initial Bootstrapping UX

Documentation/v2/internal-protocol-versioning.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Versioning
 
 Goal: We want to be able to upgrade an individual peer in an etcd cluster to a newer version of etcd.

Documentation/v2/libraries-and-tools.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Libraries and Tools
 
 **Tools**

Documentation/v2/members_api.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Members API
 
 * [List members](#list-members)

Documentation/v2/metrics.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Metrics
 
 etcd uses [Prometheus][prometheus] for metrics reporting. The metrics can be used for real-time monitoring and debugging. etcd does not persist its metrics; if a member restarts, the metrics will be reset.

Documentation/v2/other_apis.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Miscellaneous APIs
 
 * [Getting the etcd version](#getting-the-etcd-version)

Documentation/v2/platforms/freebsd.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # FreeBSD
 
 Starting with version 0.1.2 both etcd and etcdctl have been ported to FreeBSD and can

Documentation/v2/production-users.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Production Users
 
 This document tracks people and use cases for etcd in production. By creating a list of production use cases we hope to build a community of advisors that we can reach out to with experience using various etcd applications, operation environments, and cluster sizes. The etcd development team may reach out periodically to check-in on your experience and update this list.

Documentation/v2/proxy.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Proxy
 
 etcd can run as a transparent proxy. Doing so allows for easy discovery of etcd within your infrastructure, since it can run on each machine as a local service. In this mode, etcd acts as a reverse proxy and forwards client requests to an active etcd cluster. The etcd proxy does not participate in the consensus replication of the etcd cluster, thus it neither increases the resilience nor decreases the write performance of the etcd cluster.

Documentation/v2/reporting_bugs.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Reporting Bugs
 
 If you find bugs or documentation mistakes in the etcd project, please let us know by [opening an issue][etcd-issue]. We treat bugs and mistakes very seriously and believe no issue is too small. Before creating a bug report, please check that an issue reporting the same problem does not already exist.

Documentation/v2/rfc/v3api.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../../docs.md#documentation
+
+
 # Overview
 
 The etcd v3 API is designed to give users a more efficient and cleaner abstraction compared to etcd v2. There are a number of semantic and protocol changes in this new API. For an overview [see Xiang Li's video](https://youtu.be/J5AioGtEPeQ?t=211).

Documentation/v2/runtime-configuration.md

@@ -1,3 +1,8 @@
+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Runtime Reconfiguration
 
 etcd comes with support for incremental runtime reconfiguration, which allows users to update the membership of the cluster at run time.

Documentation/v2/runtime-reconf-design.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Design of Runtime Reconfiguration
 
 Runtime reconfiguration is one of the hardest and most error prone features in a distributed system, especially in a consensus based system like etcd.

Documentation/v2/security.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Security Model
 
 etcd supports SSL/TLS as well as authentication through client certificates, both for clients to server as well as peer (server to server / cluster) communication.

Documentation/v2/tuning.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Tuning
 
 The default settings in etcd should work well for installations on a local network where the average network latency is low.

Documentation/v2/upgrade_2_1.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Upgrade etcd to 2.1
 
 In the general case, upgrading from etcd 2.0 to 2.1 can be a zero-downtime, rolling upgrade:

Documentation/v2/upgrade_2_2.md

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+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 # Upgrade etcd from 2.1 to 2.2
 
 In the general case, upgrading from etcd 2.1 to 2.2 can be a zero-downtime, rolling upgrade:

Documentation/v2/upgrade_2_3.md

@@ -1,3 +1,8 @@
+**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
+
+[v3-docs]: ../docs.md#documentation
+
+
 ## Upgrade etcd from 2.2 to 2.3
 
 In the general case, upgrading from etcd 2.2 to 2.3 can be a zero-downtime, rolling upgrade: