Description of file.php and image.php are the same

[martythornley]

The header comments both use the same description for both wp-admin/includes/file.php and wp-admin/includes/image.php

• File contains all the administration image manipulation functions.

It seems file.php handles more general file functions and some functions for theme files?

[nacin]

Yeah, seems like a copy-paste job.

[tommcfarlin]

Adding an improved description to cover the types of functions that are included in file.php

[ryan]

In [21350]:

Improved phpdoc for file.php. Props tommcfarlin. fixes #21328