Adriano Melo 45ed142596 Docs: Improve BackHandler documentation (addEventListener and removeEventListener)
Summary:
This commit adds documentation to two methods of BackHandler API, addEventListener and removeEventListener. Despite being a simple change, it helps to keep the documentation consistent.

I have tested the `./website` locally, the changes look similar to some other components such as `NetInfo`.

[DOCS][ENHANCEMENT][BackHandler] - Improve BackHandler documentation (addEventListener and removeEventListener)
Closes https://github.com/facebook/react-native/pull/16618

Differential Revision: D6260935

Pulled By: hramos

fbshipit-source-id: ab04a9fca89ddaa1925844b5754caf1c355a9329
2017-11-07 10:53:59 -08:00
..
2017-04-11 12:25:38 -07:00
2017-11-06 03:46:35 -08:00
2017-09-29 00:01:10 -07:00
2017-10-09 17:46:44 -07:00
2017-03-08 00:52:17 -08:00
2015-03-23 16:47:26 -08:00
2016-08-09 06:43:46 -07:00
2016-02-27 15:58:35 -08:00
2016-02-27 15:58:35 -08:00
2017-03-08 00:52:17 -08:00
2015-08-06 20:22:24 -08:00
2015-12-15 09:09:32 -08:00
2017-10-09 17:46:44 -07:00
2017-10-09 17:46:44 -07:00
2016-08-09 06:43:46 -07:00