Scott Taylor 7d532968eb Add missing doc blocks to user.php.
`username_exists()` should return `false` instead of `null`, just like `email_exists()` does, which is right under it.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32637 602fd350-edb4-49c9-b593-d223f7449a82
2015-05-28 15:50:34 +00:00
2015-05-28 15:50:34 +00:00
2015-03-13 18:11:33 +00:00
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