manpage typos

A. Costa reported a couple of typos in the manpages and has provided a patch.

See http://bugs.debian.org/683359 and http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=tor.8.diff;att=1;bug=683359 http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=torify.1.diff;att=2;bug=683359

Cheers,