scala/scala — pull request #3864 by jxcoder (2014-07-03 10:20:15+00:00)
Title: SI-8705   Added example to Option.contains method.

I added code which described how to Option.contains method works.
```scala
// Returns true because Some instance contains string "something" which equals "something".
Some("something") contains "something"

// Returns false because "something" != "anything".
Some("something") contains "anything"

// Returns false when method called on None.
None contains "anything"
```