[ISSUE #3794] add DefaultMQPullConsumer document specification

[Kvicii]

If there is no explanation, you need to explicitly specify the replacement class

[coveralls]

Coverage increased (+0.02%) to 51.129% when pulling 4ff2e60 on Kvicii:ISSUE_3794 into 8fdfb42 on apache:develop.

[codecov-commenter]

Codecov Report

Merging #3796 (4ff2e60) into develop (8fdfb42) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #3796      +/-   ##
=============================================
- Coverage      47.09%   47.05%   -0.04%     
+ Complexity      4877     4873       -4     
=============================================
  Files            636      636              
  Lines          42453    42453              
  Branches        5549     5549              
=============================================
- Hits           19992    19978      -14     
- Misses         19960    19970      +10     
- Partials        2501     2505       +4     

Impacted Files	Coverage Δ
...ocketmq/client/consumer/DefaultMQPullConsumer.java	33.33% <ø> (ø)
...org/apache/rocketmq/store/ha/WaitNotifyObject.java	66.07% <0.00%> (-7.15%)	⬇️
.../rocketmq/broker/filter/ConsumerFilterManager.java	72.19% <0.00%> (-1.80%)	⬇️
...mq/client/impl/consumer/RebalanceLitePullImpl.java	48.52% <0.00%> (-1.48%)	⬇️
...e/rocketmq/client/impl/consumer/RebalanceImpl.java	41.79% <0.00%> (-0.79%)	⬇️
...n/java/org/apache/rocketmq/store/ha/HAService.java	71.28% <0.00%> (-0.67%)	⬇️
...he/rocketmq/client/impl/consumer/ProcessQueue.java	60.55% <0.00%> (-0.46%)	⬇️
...mq/client/impl/producer/DefaultMQProducerImpl.java	44.73% <0.00%> (-0.25%)	⬇️
...ava/org/apache/rocketmq/filter/util/BitsArray.java	59.82% <0.00%> (ø)
...a/org/apache/rocketmq/store/StoreStatsService.java	29.31% <0.00%> (+0.65%)	⬆️

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