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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