Created by: ricokahler
This is a documentation pull recommended by @mrmckeb in https://github.com/facebook/create-react-app/pull/6285#issuecomment-459770823 to let people know that --no-watch now exists.
I basically just searched for watch and test and I tried to add a bit of info here and there. I'm not a doc writer or anything and I might've missed a few spots but here ya go!
Feel free to directly edit this branch or similar. I see this PR as more of a reminder that this should be done.