adding info/link on [Public DNS Servers][1] [(diff)][2] [1]: https://trac.torproject.org/projects/tor/wiki/doc/DnsResolver/PublicDnsResolvers [2]: https://trac.torproject.org/projects/tor/wiki/doc/SupportPrograms?action=diff&version=168 URL: https://trac.torproject.org/projects/tor/wiki/doc/SupportPrograms?version=168