Tim Wang 0e93f4fa29 Fix SectionList examples in documentation
Summary:
Document to change http://facebook.github.io/react-native/releases/next/docs/sectionlist.html

This example is not documented incorrectly.

According to Flow-type in the [source code](https://github.com/facebook/react-native/blob/master/Libraries/Lists/SectionList.js#L25-L52) the `title` is not required and the `renderItem` method takes wrong `item.title` for rendering in example. See https://github.com/facebook/react-native/pull/15234#issuecomment-318555336

![screen shot 2017-07-28 at 12 24 03 pm](https://user-images.githubusercontent.com/8013313/28702472-b72d160a-738f-11e7-96ba-dcd7e8ce4ff2.png)
Closes https://github.com/facebook/react-native/pull/15234

Differential Revision: D5518721

Pulled By: hramos

fbshipit-source-id: 4effe3778aac09a0807acc8a002e588ea2d723f9
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