Broken link to "USAGE" document in main README

The [main README file](https://github.com/wasabigeek/railshelp/blob/6a1f39b79ae8f557ba85a4e01a1ec94b19750342/README.md#references) contains a broken link to a file named [USAGE](https://github.com/rails/rails/blob/main/railties/lib/rails/generators/rails/model/USAGE) which does not exist.