PHPDoc fixes for functionality in wp-includes/wp-db.php added in 3.9.

See #27700.

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Improve hook docs for the `resetpass_form` hook added in 3.9.

See #21044, #27700.

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Even deprecated functions can use a little PHPDoc formatting, time to time.

See #27700.

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Only show the media library loading spinner if we're scrolled toward the bottom. Prevents the spinner from flashing a second time when first loading the library due to a second query firing after initial load.

props kovshenin. fixes #24859.

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More formatting for functions deprecated in 3.9.

Props kpdesign.
Fixes #27700.

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Clean up deprecated format_to_post() docs. see #27700.

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Rename USE_EXT_MYSQL to WP_USE_EXT_MYSQL. see #21663.

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Make playlist tracks keyboard-accessible. 

Fixes #27644.


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Fix typo and add more text to the error shown when 'wpdialogs' is not enqueued. Add 'wp_enqueue_editor' action fired when scripts and styles for the editor are being enqueued, fixes #16284
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