Update info under "Users"

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Shouldn't you use
$u->checkLogin()
under "If a user is logged in do something" instead of
$u->isRegistered()
as per
http://www.concrete5.org/community/forums/customizing_c5/isloggedin...
http://www.concrete5.org/documentation/developers/permissions/users...

And what is the difference between
$u->checkLogin()
and
$u->isLoggedIn()

timtorres