drop ok-guards for now

examples.txt

@@ -20,7 +20,6 @@ Methods
 # Interfaces
 # Embedding
 # Errors
-# OK Guards
 Goroutines
 Channels
 Channel Buffering

examples/ok-guards/ok-guards.go

@@ -1,20 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-    x := make(map[string]string)
-    x["here"] = "yes"
-
-    if name, ok := x["?"]; ok {
-        fmt.Println(name)
-    } else {
-        fmt.Println("miss")
-    }
-
-    if name, ok := x["here"]; ok {
-        fmt.Println(name)
-    }
-}
-
-// todo: note about use with errors