delete md

Author: zhaohai666

rocketmq-v5-client-spring-boot/src/main/java/org/apache/rocketmq/client/autoconfigure/RocketMQProperties.java

@@ -187,7 +187,7 @@ public static class SimpleConsumer {
         /**
          * Tag of consumer.
          */
-        private String tag;
+        private String tag = "*";
 
         /**
          * Topic name of consumer.