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react-native/Libraries/Lists/ListView
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Garrett McCullough 8117fa16c9 Improve the documentation for ListView and ListViewDataSource 
Summary:
What existing problem does the pull request solve?
My motivation was to improve the documentation for ListView and ListViewDataSource because I always have trouble remembering how they work and the documentation was lacking an example for `cloneWithRowsAndSections`

My PR does the following:
* add a note about how headers and footers are rendered on a horizontal ListView
* fix a typo in an example
* clarify that the sectionIdentities should match the keys or array indexes of the data source
* add an example of cloneWithRowsAndSections
* add notes on the return values of `getRowCount` and `getRowAndSectionCount`

n/a; documentation only

![screenshot of ListViewDataSource changes](https://cloud.githubusercontent.com/assets/580060/25768881/d339544a-31c1-11e7-88a1-5e60bc008500.png)
Closes https://github.com/facebook/react-native/pull/13811

Differential Revision: D5473192

Pulled By: hramos

fbshipit-source-id: f31fc6edfdeb8dff75d39bbcceda06fd839df934
 		2017-07-21 14:31:17 -07:00
..
__mocks__ prettier 2017-06-12 22:45:49 -07:00
ListView.js Improve the documentation for ListView and ListViewDataSource 2017-07-21 14:31:17 -07:00
ListViewDataSource.js Improve the documentation for ListView and ListViewDataSource 2017-07-21 14:31:17 -07:00