Christine Abernathy b664e6e734 Update AsyncStorage doc ...

Summary:
Relates to #8203 for AsyncStorage API update.

- Added a small example to the intro section.
- Added jsdoc format tags to show up class description, parameter descriptions.
- Word-smithed many of the method descriptions.

I also made a bug fix to the autogen. It wasn't handling the scenario where a method may have no parameters.

**Test plan (required)**

Wrote a small sample app to test the snippet added to the intro section.

Ran website locally: http://localhost:8079/react-native/docs/asyncstorage.html

![api_asyncstorage](https://cloud.githubusercontent.com/assets/691109/16329457/84f9d69c-3997-11e6-9e68-3a475df90377.png)

Ran changed files through the linter.
Closes https://github.com/facebook/react-native/pull/8396

Differential Revision: D3481783

Pulled By: JoelMarcey

fbshipit-source-id: ebc4b9695482ada8a3455e621534d2a7fb11edf4

2016-06-24 08:43:36 -07:00

..

AsyncStorage.js

Update AsyncStorage doc

2016-06-24 08:43:36 -07:00