fix: relaylist: Comment on IPv6 exit policy

that could be also checked, increasing the chances that the exit can
exit to our Web servers.
But if it could not, then we need to retry to measure it as 1st hop.

sbws/lib/relaylist.py

@@ -205,6 +205,11 @@ class Relay:
                 # and ips and that port. See #40006.
                 # Using `strip_private` to ignore reject rules to private
                 # networks.
+                # We could increase the chances that the exit can exit
+                # checking IPv6 with:
+                # ``or self.exit_policy_v6.can_exit_to(port=443, strict=True)``
+                # But if it can still not exit to our Web server, then we
+                # should retry to measure it as entry.
                 return (
                     self.exit_policy.strip_private()
                     .can_exit_to(port=port, strict=True)