Correct some @since values added in [29739].

see #28459.
Built from https://develop.svn.wordpress.org/trunk@29743


git-svn-id: http://core.svn.wordpress.org/trunk@29517 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct @return value for WP_User_Query::get_total().

props jesin.
fixes #29656.
Built from https://develop.svn.wordpress.org/trunk@29744


git-svn-id: http://core.svn.wordpress.org/trunk@29518 1a063a9b-81f0-0310-95a4-ce76da25c4cd