Clearer 'realm permit' manual page example
Clearer 'realm permit' manual page example

Also remove duplicated information.

https://bugzilla.redhat.com/show_bug.cgi?id=985800

freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd