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.

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Inline documentation for hooks in wp-includes/nav-menu.php.

Props dustyf, kpdesign.
Fixes #27367.

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Widget Customizer: Fix shift+click issue in Firefox to open a widget.

props westonruter.
see #27358.
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Widget Customizer: Improve widget highlighting.

* Prefix box-shadow in inject_preview_css()
* Remove border-radius in inject_preview_css()
* Prevent hidden box-shadows in Customizer

see #27358.
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Custom backgrounds: Do not print the default background color when it has been saved to the DB.

props obenland.
fixes #22030.

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Custom backgrounds: Always cause a preview in the customizer.

Omitted from [27703].

props obenland.
see #22030.

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Update Dashicons.

* Includes new Media icons, see #26650.
* Includes icons for clipboard, megaphone, schedule, tickets, nametag, universal-access, microphone and <3.
* Includes icon for randomize, see #21785.
* Updates Google+ icon, fixes #26851.

props melchoyce, empireoflight.
see #26936.
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Multisite: Don't set the $super_admins global in grant_super_admin(), revoke_super_admin().

Adds tests and docs.

props jdgrimes.
see #27205.

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