change recommended from 10 -> 16 MBit/s (since it has a 2MBit/s requirement) and 16MBit are needed for the guard flag ([diff](https://trac.torproject.org/projects/tor/wiki/OperatorsTips?action=diff&version=76)) URL: https://trac.torproject.org/projects/tor/wiki/OperatorsTips?version=76