Christine Abernathy 4ec53ee8fa Update Navigator component doc
Summary:
Related to #8203 to update the Navigator component reference doc.

**Test plan (required)**

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

![component_navigator_2](https://cloud.githubusercontent.com/assets/691109/16280426/3f2cdc32-3874-11e6-810b-ca34d7bd4972.png)

**Note**

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/8318

Differential Revision: D3471185

Pulled By: JoelMarcey

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