Eric Nakagawa 167654248b Api documentation update for modal.js ...

Summary:
Related to #8203 to update the Modal API reference doc.

**Test plan (required)**

Started up the website and checked:
http://localhost:8079/react-native/docs/modal.html

![modal update](https://cloud.githubusercontent.com/assets/23874/16316792/ecde19cc-393c-11e6-8136-16243a199d9b.png)

**Note, copied from a previous PR**

The code is not Flow-ified so depended on jsdoc formatting to get the method parameter types. There's a current issue with handling optional types via react-docgen which parses components. There's an open PR to look into this: https://github.com/reactjs/react-docgen/pull/89. When that's resolved the `replaceAtIndex` method parameter type that's documented for `cb` needs to be updated to make it optional.
Closes https://github.com/facebook/react-native/pull/8375

Differential Revision: D3479536

Pulled By: caabernathy

fbshipit-source-id: de2db3aa221e4adce0c0c5f3d94a1fad528a60da

2016-06-23 18:58:30 -07:00

..

Modal.js

Api documentation update for modal.js

2016-06-23 18:58:30 -07:00