Use parens to ensure that RegEx OR matches the front when determining that mime-type matches `audio|video` in `attachment_submitbox_metadata()`.

Props kovshenin.
See #23926.


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Improve inline documentation for the `multi_resize()` method in `WP_Image_Editor`, `WP_Image_Editor_GD`, and `WP_Image_Editor_Imagick`.

Props paolal for the initial patch.
Fixes #25530.

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Twenty Fourteen: reduce post widget margin, props kraftbj, closes #25426.

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Twenty Fourteen: accent color fixes, props celloexpressions. See #25220.

 * Try a darker text color for header nave submenu items on hover (matching site description color). 
 * Fix a bad hover color override. 

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Twenty Fourteen: provide keyboard support for the primary navigation, props joedolson. See #25054.

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

Props nukaga, johnbillion.
Fixes #25509.

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Inline documentation for hooks in wp-includes/class-feed.php.

Props swissspidy.
Fixes #25510.

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Inline documentation for hooks in wp-admin/widgets.php.

Props r3df, kpdesign.
Fixes #25501.

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Twenty Fourteen: allow pages to have featured images, props iamtakashi. Fixes #25325.

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 Twenty Fourteen: fill browser height to 100% for views with short content. Accounts for footer widgets, in which case the height isn't set to 100% so that the widgets remain visible. Props wycks and taupecat, fixes #25389.

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