Fixed typo in TouchableNativeFeedback docs

Summary: Closes https://github.com/facebook/react-native/pull/2843

Reviewed By: @​svcscm

Differential Revision: D2457197

Pulled By: @foghina

Libraries/Components/Touchable/TouchableNativeFeedback.android.js

@@ -70,7 +70,7 @@ var PRESS_RECT_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
  *       <View style={{width: 150, height: 100, backgroundColor: 'red'}}>
  *         <Text style={{margin: 30}}>Button</Text>
  *       </View>
- *     </TouchableHighlight>
+ *     </TouchableNativeFeedback>
  *   );
  * },
  * ```