Adds a unit test to demonstrate that the order of `case` and `default` in a `switch` statement does not matter.

See #27882.



git-svn-id: https://develop.svn.wordpress.org/trunk@28631 602fd350-edb4-49c9-b593-d223f7449a82
Remove unnecessary "not used" notation for filter parameters in wp-admin/includes/media.php.

Also add `@param` and `@return` descriptions.

See #28408.


git-svn-id: https://develop.svn.wordpress.org/trunk@28632 602fd350-edb4-49c9-b593-d223f7449a82