Inline documentation for hooks in wp-includes/theme.php.

Props ShinichiN.
Fixes #25588.

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Inline documentation for hooks in wp-includes/ms-blogs.php.

Props miyauchi, kpdesign.
Fixes #25596.

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

Props aaronholbrook for the initial patch.
Fixes #26099.

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Themes: Fix HTML markup for screenshots. props kovshenin. fixes #25959.
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