Change name of the file to edit

[MartinCerny-awin]

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

Motivation

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

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[pull-bot]

	Warnings
⚠️	📋 Test Plan - This PR appears to be missing a Test Plan.
⚠️	📋 Release Notes - This PR appears to be missing Release Notes.

	Messages
📖	📄 Docs - Thanks for your contribution to the docs!

@facebook-github-bot label Documentation

@facebook-github-bot label Needs more information

@facebook-github-bot label Needs more information

Attention: @hramos

Generated by 🚫 dangerJS

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[facebook-github-bot]

@shergin is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.