Summary:
Just a little nit pick to add extra information to this doc. I spent a few hours trying to fix this problem because I had not placed the code in build.gradle correctly. I think this small addition would be useful to others.
Closes https://github.com/facebook/react-native/pull/12475
Differential Revision: D4608443
Pulled By: hramos
fbshipit-source-id: eb719d5cf9d905c4f043ec71f1a3e28e0219626e