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

See #27016.


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Fixes for `jshint`

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Editing image file: properly refresh the view after restoring the original image or rescaling the image. Props gcorne, see #21811
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Merge two strings. see #27320, #27453.

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Add context to 'Browse' (themes). see #27055, #27453.

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