chore(nix): remove stale phased-rollout comments in network + gateway modules

nix/modules/hive-gateway.nix

@@ -949,7 +949,6 @@ in
           # container. Listens on the bridge interface from
           # `services.hyperhive.network`; authoritative for the hive
           # domain + sub-domains, forwards everything else upstream.
-          # No-op when `network.enable = false`.
           services.dnsmasq = lib.mkIf networkCfg.enable {
             enable = true;
             # Don't substitute the container's /etc/resolv.conf —