Replace jenkins with example.org in public facing error message. (#236)

src/main/java/org/jenkinsci/plugins/gwt/GenericWebHookRequestReceiver.java

@@ -53,7 +53,7 @@ public class GenericWebHookRequestReceiver extends CrumbExclusion implements Unp
           + GenericTrigger.class.getSimpleName()
           + " configured! "
           + "If you are using a token, you need to pass it like ...trigger/invoke?token=TOKENHERE. "
-          + "If you are not using a token, you need to authenticate like http://user:passsword@jenkins/generic-webhook... ";
+          + "If you are not using a token, you need to authenticate like http://user:passsword@example.org/generic-webhook... ";
   private static final String URL_NAME = "generic-webhook-trigger";
   private static final Logger LOGGER =
       Logger.getLogger(GenericWebHookRequestReceiver.class.getName());