Inline documentation for three remaining hooks in wp-includes/general-template.php.

Documents the `login_form_top`, `login_form_middle`, and `login_form_bottom` and filters.

That's 184/184 hook docs files complete. Boom!

Props kpdesign, DrewAPicture.
Fixes #27719.

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Final about page text.

props siobhan, kerikae, DH-Shredder, nacin.
see #27713.

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Fix typo on about page.

props helen.
see #27713.

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Allow the API to add text to auto update emails.

fixes #27812.

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3.9-RC2

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Fix entities on about page. see #27713.

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Background Updates: Avoid a PHP warning during theme update checks when there are multiple theme directories registered. Fixes #27815

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Bump Akismet external in trunk (3.9-RC2) to 3.0.0.


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