Fix strict notices in Tests_POMO_PO.

props markoheijnen for initial patch.
fixes #25631.
Built from https://develop.svn.wordpress.org/trunk@26500


git-svn-id: http://core.svn.wordpress.org/trunk@26394 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/theme.php.

Props ShinichiN.
Fixes #25588.

Built from https://develop.svn.wordpress.org/trunk@26501


git-svn-id: http://core.svn.wordpress.org/trunk@26395 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/ms-blogs.php.

Props miyauchi, kpdesign.
Fixes #25596.

Built from https://develop.svn.wordpress.org/trunk@26502


git-svn-id: http://core.svn.wordpress.org/trunk@26396 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/user.php.

Props aaronholbrook for the initial patch.
Fixes #26099.

Built from https://develop.svn.wordpress.org/trunk@26503


git-svn-id: http://core.svn.wordpress.org/trunk@26397 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Themes: Fix HTML markup for screenshots. props kovshenin. fixes #25959.
Built from https://develop.svn.wordpress.org/trunk@26504


git-svn-id: http://core.svn.wordpress.org/trunk@26398 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets: improve the help text on the Widgets screen, props siobhan, props Hanni, fixes #26244.
Built from https://develop.svn.wordpress.org/trunk@26505


git-svn-id: http://core.svn.wordpress.org/trunk@26399 1a063a9b-81f0-0310-95a4-ce76da25c4cd