Update readme in trunk.

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Allow passing `false` for the `meta_box_cb` arg in `register_taxonomy()` to turn off the meta box display entirely. fixes #21543.

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Inline documentation for hooks in wp-includes/functions.wp-scripts.php.

Props ninio for the initial patch.
Fixes #25720.

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Inline documentation for hooks in wp-includes/functions.wp-styles.php.

Props admiralthrawn.
Fixes #25722.

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

Props ninio, kpdesign.
Fixes #25723.

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