Christine Abernathy 8e9e489f21 Update webview doc
Summary:
Reference: #8203

Changes made:

Added a webview example to the intro section
Added more details to prop explanations
Test plan (required)

Ran the website locally and checked: http://localhost:8079/react-native/docs/webview.html

![component_webview_2](https://cloud.githubusercontent.com/assets/691109/16316552/f6847c56-393b-11e6-8fdd-a0b61e7f787b.png)
Closes https://github.com/facebook/react-native/pull/8372

Differential Revision: D3477685

Pulled By: JoelMarcey

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