Merge pull request #3022 from heihaozi/maxReconsumeTimes

[ISSUE #3021] Improve the comment of maxReconsumeTimes.

client/src/main/java/org/apache/rocketmq/client/consumer/DefaultMQPushConsumer.java

@@ -236,11 +236,11 @@ public class DefaultMQPushConsumer extends ClientConfig implements MQPushConsume
     private boolean unitMode = false;
 
     /**
-     * Max re-consume times. -1 means 16 times.
-     * </p>
+     * Max re-consume times. 
+     * In concurrently mode, -1 means 16;
+     * In orderly mode, -1 means Integer.MAX_VALUE.
      *
-     * If messages are re-consumed more than {@link #maxReconsumeTimes} before success, it's be directed to a deletion
-     * queue waiting.
+     * If messages are re-consumed more than {@link #maxReconsumeTimes} before success.
      */
     private int maxReconsumeTimes = -1;