Improve inline doc descriptions in `media-views.js`.

Props ericlewis.
See #28459.

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As per @gcorne's suggestion, when calling `wp.mce.views.register()`, automatically set `shortcode` equal to the passed `type` in the set of default args instead of introducing a `type` property. It is still overrideable by the args that are passed.

See #28458.


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Twenty Fourteen: fix playlist track color in content sidebar. Props celloexpressions, fixes #28457.
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Twenty Fourteen: Apply `max-width` values to avoid site title breaking the layout in small screens. Props sixhours, rclations. See #28237.
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Twenty Fourteen: update to Genericons 3.0.3. Props celloexpressions, closes #28456.
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Twenty Thirteen: update to Genericons 3.0.3. Props celloexpressions, lancewillett. Closes #25391.
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Twenty Fourteen: first pass at better Audio/Video player styling with genericons. Props celloexpressions, see #26469.
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Use get_pages() instead of a raw SQL query in get_body_class().

fixes #28159.
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