Docs: fixed errors in some documented config settings defaults

docs/server/source/server-reference/configuration.md

@@ -88,32 +88,31 @@ export BIGCHAINDB_DATABASE_NAME=bigchain
 export BIGCHAINDB_DATABASE_REPLICASET=bigchain-rs
 ```
 
-**Example config file snippet**
+Note: If the backend database is RethinkDB, you *can* set `BIGCHAINDB_DATABASE_REPLICASET` but it won't be used for anything.
+
+**Default values**
+
+If (no environment variables were set and there's no local config file), or you used `bigchaindb -y configure rethinkdb` to create a default local config file for a RethinkDB backend, then the defaults will be:
 ```js
 "database": {
     "backend": "rethinkdb",
     "host": "localhost",
-    "port": 28015,
     "name": "bigchain",
+    "port": 28015
+}
+```
+
+If you used `bigchaindb -y configure mongodb` to create a default local config file for a MongoDB backend, then the defaults will be:
+```js
+"database": {
+    "backend": "mongodb",
+    "host": "localhost",
+    "name": "bigchain",
+    "port": 27017,
     "replicaset": "bigchain-rs"
 }
 ```
 
-**Default values (a snippet from `bigchaindb/__init__.py`)**
-```python
-'database': {
-    'backend': os.environ.get('BIGCHAINDB_DATABASE_BACKEND', 'rethinkdb'),
-    'host': os.environ.get('BIGCHAINDB_DATABASE_HOST', 'localhost'),
-    'port': int(os.environ.get('BIGCHAINDB_DATABASE_PORT', 28015)),
-    'name': os.environ.get('BIGCHAINDB_DATABASE_NAME', 'bigchain'),
-    'replicaset': os.environ.get('BIGCHAINDB_DATABASE_REPLICASET', 'bigchain-rs')
-}
-```
-
-**Note**: We are currently adding support for MongoDB. The `replicaset` and
-`BIGCHAINDB_DATABASE_REPLICASET` option is only used if the `backend` or
-`BIGCHAINDB_DATABASE_BACKEND` is set to `"mongodb"`.
-
 
 ## server.bind, server.workers & server.threads