Revert [29267], as it causes unit test breakage and appears unnecessary. see #28986.

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Fix a typo in the PHPDoc for `get_stylesheet()`.

Props lgedeon.
Fixes #28985.

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git-svn-id: http://core.svn.wordpress.org/trunk@29057 1a063a9b-81f0-0310-95a4-ce76da25c4cd