version 37 comment: revise eventdns advice in light of ticket [#21394](https://trac.torproject.org/projects/tor/ticket/21394) ([diff](https://trac.torproject.org/projects/tor/wiki/doc/DnsResolver?action=diff&version=38)) URL: https://trac.torproject.org/projects/tor/wiki/doc/DnsResolver?version=38