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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