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

Props dougwollison for the initial patch.
Fixes #25496.

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Inline documentation for hooks in wp-admin/includes/schema.php.

Props johnafish, kpdesign.
Fixes #25498.

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Inline documentation for hooks in wp-admin/network/site-users.php.

Props sboisvert for the initial patch. Props kpdesign.
Fixes #25497.

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

Props dougwollison.
Fixes #25495.

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Inline documentation for hooks in wp-includes/admin-bar.php.

Props swissspidy.
Fixes #25508.

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Inline documentation for hooks in wp-admin/async-upload.php.

Props rzen for the initial patch.
Fixes #25517.

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Bump the TinyMCE version for 3.8, see #25700.
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