Correct misleading verbiage in 'print' hook docs.

Standardizes 'print' hook docs on the concept that hooks are fired when scripts and styles are printed.

Props ericlewis for the initial patch.
Fixes #26924.

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Fix typo from [27695]. See #26924.

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Inline documentation for hooks in wp-includes/default-widgets.php.

Props janw.oostendorp and kpdesign.
Fixes #25638.

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

Props raamdev and kpdesign.
Fixes #25826.

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

Props adamsilverstein, DrewAPicture.
Fixes #26979.

Built from https://develop.svn.wordpress.org/trunk@27699


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