Summary:
I was reading the documentation and noticed a few typos and grammar mistakes.
- rely -> relies
- Adding 'a' and 'its' and 'the' where appropriate
- Minor simplifications
Closes https://github.com/facebook/react-native/pull/12385
Differential Revision: D4570713
Pulled By: hramos
fbshipit-source-id: dbf0506306fd16b3454a2ec96792bda2c7bcaa70