Correct phpdoc for Add New User screen in network admin. props zeo. fixes #24446.

git-svn-id: http://core.svn.wordpress.org/trunk@24383 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Heartbeat: in isLocalFrame() compare window.location.origin to iframe.src to stop most cases where WebKit triggers errors about different iframe origin, see #23216

git-svn-id: http://core.svn.wordpress.org/trunk@24384 1a063a9b-81f0-0310-95a4-ce76da25c4cd