Make it clear that multi-relay operators are expected to set a working ContactInfo and proper MyFamily

As per discussion with David on bad-relays@ I'm opening this ticket as he requested.

We want to make it clear to tor relay operators that setting a proper ContactInfo (working email address) and MyFamily (fully mutual configuration) is strongly encouraged (required?) for relay operators that run more than 3 (?) tor instances, relays showing up without such configuration likely raise a red flag and might get rejected from the network.

places to update:

• manual page:

• ContactInfo

• MyFamily

• relay documentation (#24497 (moved))