update urls in sample torrc
src/config/torrc.sample.in has three busted URLs:
https://www.torproject.org/tor-manual.html (now a 404) https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ#torrc (broken anchor) https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ#MultipleServers (broken anchor)
We should do what we can to make these URLs work more, and then maybe change the torrc.sample so they're more right in the future.
I think it's too late for a change to 0.2.2 though, since we already put out the stable and weasel (rightly) hates it every time we change it since it makes all the debian/ubuntu users have to manually do stuff during update.