Clarify wording in adding TypeScript to existing project (#9231)
Clarify wording in adding TypeScript to existing project (#9231)


facebookincubator/create-react-app,jdcrensh/create-react-app,jdcrensh/create-react-app,jdcrensh/create-react-app,facebookincubator/create-react-app,jdcrensh/create-react-app,facebookincubator/create-react-app