Clarify "address" in man page: IPv4, IPv6, hostname?
The DirAuthority line only takes an IPv4 address as an "address". But other torrc options take IPv6 addresses or hostnames.
We should clarify what we mean when we say "address".
Reported by Andrew Smith: https://lists.torproject.org/pipermail/tor-relays/2017-February/011876.html