Trace logging message made more specific.

src/net/java/sip/communicator/impl/protocol/irc/IrcStack.java

@@ -884,7 +884,7 @@ public void onServerNumericMessage(ServerNumericMessage msg)
                 break;
             default:
                 LOGGER.trace("This ServerNumericMessage (" + code
-                    + ") will not be handled.");
+                    + ") will not be handled by the ServerListener.");
                 break;
             }
         }