Add JSDoc blocks to `media-audiovideo.js`.

See #27016.


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Fixes for `jshint`

Built from https://develop.svn.wordpress.org/trunk@27643


git-svn-id: http://core.svn.wordpress.org/trunk@27486 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editing image file: properly refresh the view after restoring the original image or rescaling the image. Props gcorne, see #21811
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git-svn-id: http://core.svn.wordpress.org/trunk@27487 1a063a9b-81f0-0310-95a4-ce76da25c4cd