Add missing variable for inline hook documentation changes in wp-includes/vars.php.

See #25466.

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Move the revisions upgrade handler to POST, to avoid esoteric metadata stomping.

props SergeyBiryukov.
see #25023.
for trunk.

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Prevent the removal of a manual 'orderby' attribute in the gallery shortcode.

props nofearinc.
fixes #24868.

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Inline documentation for hooks in wp-settings.php.

Props miyauchi.
Fixes #25469

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

Props johnafish.
Fixes #25502.

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

Props swissspidy, kpdesign.
Fixes #25527.

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

Props ben.moody
Fixes #25503.

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Inline documentation for hooks in wp-admin/maint/repair.php.

Props ben.moody, kpdesign.
Fixes #25500.

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

Props swissspidy, kpdesign.
Fixes #25515.

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