Zhao Han 40da7bb835 Add more documentation in ListViewDataSource
Summary:
ListViewDataSource's default data extractor can actually expect another data form:

`{ sectionID_1: [ <rowData1>, <rowData2>, ... ], ... }`
Closes https://github.com/facebook/react-native/pull/1285
Github Author: Zhao Han <cx.chenghai+github@gmail.com>

Test Plan: Changed the ListViewExample to make sure all three formats work.
2015-05-15 13:47:43 -08:00
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