Inline documentation for hooks in wp-admin/includes/user.php.

Props aaronholbrook for the initial patch.
Fixes #26099.


git-svn-id: https://develop.svn.wordpress.org/trunk@26503 602fd350-edb4-49c9-b593-d223f7449a82
Themes: Fix HTML markup for screenshots. props kovshenin. fixes #25959.

git-svn-id: https://develop.svn.wordpress.org/trunk@26504 602fd350-edb4-49c9-b593-d223f7449a82