Code documentation of WebformManagedFileBase.php

Really makes sense. Good catch

I just take the opportunity and also update the method getBooleanTotal that was saying @return int but was returning null here. So when it can return either NULL or an int, we can use the @return int|null annotation comment block to indicate this

MR contains the #2 and this improvement above: https://git.drupalcode.org/project/webform/-/merge_requests/292

Automatically closed - issue fixed for 2 weeks with no activity.