typo in '--help': index -> create-react-app

Created by: funderburkjim

I am a beginning to learn react. After installing create-react-app, I issued the (empty) command

$ create-react-app
Please specify the project directory:
  index <project-directory>

For example:
  index my-react-app

Run index --help to see all options.

As you see, the word 'index' appears where the word 'create-react-app' should appear.

Similar typo in 'create-react-app --help'.

This small typo is confusing to the beginner.