Prop 311: 6.1. Ask Relay Operators to Test IPv6 Reachability

See #33229 (moved) for advice on testing stages.

Write an email to the tor-relays list, asking relay operators to help test the proposal 311 IPv6 ORPort Reachability and Extends changes.

Once these changes are merged, volunteer relay and bridge operators will be able to test them by: * compiling from source, * running nightly builds, or * running alpha releases.

See proposal 311, section 6.1, relay operator test part: https://gitweb.torproject.org/torspec.git/tree/proposals/311-relay-ipv6-reachability.txt#n671

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