Summary:
The line
`Please make sure you export the correct path for 'ANDROID_HOME' if you did not install the Android SDK using Android Studio.`
was visible twice (one on top of another) in the docs when viewing linux instructions. I removed the block that set it visible on both linux and windows and incorporated it into the existing windows block.
Closes https://github.com/facebook/react-native/pull/11276
Differential Revision: D4269783
Pulled By: hramos
fbshipit-source-id: 423fca3219567cf96d91aefc43d1ddabb2403728