Provide some description to built-in roles
|Assigned To:||Marek Hulán|
|Found in release:||Pull request:||https://github.com/theforeman/foreman/pull/4787|
|Velocity based estimate||-|
After #4608 was added we didn't provide any role description for built-in roles. Now since roles also locked, users can't go to form to see the value there so we should display it in roles overview.