config/switch: doc server1 ports

config/switch.nix

@@ -34,6 +34,8 @@
         iso3.ports = [ "g4" ];
         mgmt.ports = [ "g1" ];
         serv.ports = [ "g22" ];
+        # server1 had g46,g47,g48 too but this switch has too few
+        # port-channel groups
         server1.ports = [ "g24" ];
         server2 = {
           group = "1";