Removed requirement for a File-wide PHPDoc

[samsouder]

Basically, the file-wide PHPDoc seems a bit redundant in our modern code, as we require docs for classes and functions.

[johnmaguire]

I think the reason we haven't removed this is we wanted to enforce "one or the other." Constants files for example don't have any classes in them. Though maybe the constants should be moved inside of classes.

[mrrsm]

Like @johnmaguire said most of our code isn't classes right now so it should have filedocs explaining what is in that file. If you are using codeclimate you can add an exclude for your project so it doesn't run that sniff in the meantime.