Christine Abernathy cc8cf8f0f2 Simplify guide and make it more prescriptive
Summary:
This is related to #8157. Updated the guide and made it simpler and more prescriptive.

**Testing**

- cd react-native
- npm install
- cd website
- npm install
- npm start
- Go to http://localhost:8079/react-native/docs/platform-specific-code.html
- Checked content

![platform-specific-update](https://cloud.githubusercontent.com/assets/691109/16205926/f5fd0662-36da-11e6-978c-e364688facf6.png)
Closes https://github.com/facebook/react-native/pull/8251

Differential Revision: D3458249

Pulled By: JoelMarcey

fbshipit-source-id: 5568337af92da53ee6cd53541591eb01ae323f4f
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