Summary:
References #7070
<!--
Thank you for sending the PR! We appreciate you spending the time to work on these changes.
Help us understand your motivation by explaining why you decided to make this change.
You can learn more about contributing to React Native here: http://facebook.github.io/react-native/docs/contributing.html
Happy contributing!
-->
Docs are incomplete, start filling them out
N/A
Closes https://github.com/facebook/react-native/pull/16346
Differential Revision: D6057501
Pulled By: hramos
fbshipit-source-id: c30d3369fa1a73ef6a93c2ed8f8c53af5a1af7ee