Inline documentation for hooks in wp-admin/includes/class-wp-theme-install-list-table.php.

Props kpdesign for the cleanup.
Fixes #27293.

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

Fixes #27294.

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

Props kpdesign for the cleanup.
Fixes #27295

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

Props kpdesign for the typo fix.
Fixes #27296.

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Use `wp_get_attachment_url()` instead of the GUID when getting header image URLs. Fixes #27222. Props Kopepasah.
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We shall pledge to run `jshint` before committing.

Props nacin for the nudge.


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Make widget customizer code pass JSHint.

Fixes #27298.


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Revisions: Restore [24929] which was reverted in [26072].

props avryl.
fixes #27267.
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