Inline documentation for the following filter hooks in wp-includes/pluggable.php:
* `comment_notification_recipients`
* `comment_notification_notify_author`

Also removes some generic `@uses` tags from various related doc blocks.

Props markjaquith.
Fixes #25699.

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Remove button-secondary class from Collapse link in theme installer; unify Collapse button styles in theme installer and Customize screen; add a border around the Collapse icon so it remains visible on dark backgrounds; move the color styles to colors-fresh. Fixes #26230.
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Dashboard JS cleanup. props kadamwhite, helen. see #25824.

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When MP6 was merged into core, the new MCE images weren't added. Replace old MCE gifs with new PNGs and correct the paths to their 2x versions. See #26232.
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