Change name of the file to edit
Change name of the file to edit

Summary:
The text that appears on screen is in App.js component.

The project that is being generated using react-native shows `To get started, edit App.js` text when run, but the documentation says to edit index.js file. The text is actually present in App.js, therefore the app is correct, but the documentation is not.

[DOCS] [ENHANCEMENT] [GettingStarted.md] - Wrong name of the file to edit
Closes https://github.com/facebook/react-native/pull/16550

Differential Revision: D6184953

Pulled By: shergin

fbshipit-source-id: c7385a349de8983aff80af8b393b3a973b4ef5cf

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