Add a missing `@return` description for `WP_Screen::get_option()`.

Also declare the default value for the `$key` parameter.

Props dustyf for the initial patch.
Fixes #30363.

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Fix parameter description syntax for `WP_Screen::get_option()`.

Props zrothauser for the initial patch.
See [30368]. Fixes #30363.

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Add inline `@see` tags to the docs for the `get_categories_taxonomy` hook.

Props tw2113.
Fixes #30310.

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Twenty Ten, Eleven, Thirteen: add bottom margin to audio and video players.

Fixes #29146. Props mikeyarce, gregrickaby, DavidTheMachine, jeanyoungkim, ccprice.

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Twenty Fifteen: pinking shears.

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