Generate docs from changes to products in Katello v2 API

These changes add the documentation generated by ```/bin/generate.rb -u http://localhost:3000/apidoc --api-version v2``` based on changes to the ```ProductsController``` and v2 API in [https://github.com/Katello/katello/pull/3479](https://github.com/Katello/katello/pull/3479).