update document

xxl-job-admin/src/main/java/com/xxl/job/admin/core/thread/JobTriggerPoolHelper.java

             new ThreadFactory() {
                 @Override
                 public Thread newThread(Runnable r) {
-                    return new Thread(r, "xxl-job, admin JobTriggerPoolHelper-triggerPool" + r.hashCode());
+                    return new Thread(r, "xxl-job, admin JobTriggerPoolHelper-triggerPool-" + r.hashCode());
                 }
             });