docs(workarounds): drop WA-034, removed with the gateway's fake-IP IPv6

bb899876 moved the proxy gateway to fake-IP for IPv6 and removed
aquamarine's getaddrinfo precedence table, so the row's removal condition
has been met since 2026-10-14; only the row and a comment pointer lingered.

Assisted-by: Claude Code (claude-opus-5-5)

hosts/idols-aquamarine/default.nix

@@ -108,7 +108,7 @@ in
 
   # A `boot.kernel.sysctl` that disabled IPv6 was removed on 2026-10-14: networkd
   # re-enables it on the wired link for the `DHCP = "ipv6"`/`IPv6AcceptRA` settings
-  # below, so it never applied and the AAAA attempt already fails at once (WA-034).
+  # below, so it never applied. The gateway now hands out fake-IP AAAA records too.
 
   networking.useNetworkd = true;
   systemd.network.enable = true;