Hint for passing navigator in renderScene

Summary: Closes https://github.com/facebook/react-native/pull/4999

Reviewed By: svcscm

Differential Revision: D2790687

Pulled By: androidtrunkagent

fb-gh-sync-id: af055123b351e37081a37d6153333666a878113c

Libraries/CustomComponents/Navigator/Navigator.js

@@ -203,7 +203,7 @@ var Navigator = React.createClass({
      *
      * ```
      * (route, navigator) =>
-     *   <MySceneComponent title={route.title} />
+     *   <MySceneComponent title={route.title} navigator={navigator} />
      * ```
      */
     renderScene: PropTypes.func.isRequired,