[ISSUE #3728] docs: Make the 'Uses of keys' entry in the document 'Best practices' more complete.

[XiaoyiPeng]

Make sure set the target branch to develop

What is the purpose of the change

For #3728

[coveralls]

Coverage decreased (-0.01%) to 53.122% when pulling ae29fa2 on XiaoyiPeng:docs_uses_of_keys into d564dcd on apache:develop.

[codecov-commenter]

Codecov Report

Merging #3729 (ae29fa2) into develop (ed5f4e4) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #3729      +/-   ##
=============================================
- Coverage      47.29%   47.17%   -0.12%     
+ Complexity      5042     5022      -20     
=============================================
  Files            628      628              
  Lines          41409    41406       -3     
  Branches        5379     5379              
=============================================
- Hits           19584    19533      -51     
- Misses         19395    19452      +57     
+ Partials        2430     2421       -9     

Impacted Files	Coverage Δ
...rg/apache/rocketmq/common/stats/StatsSnapshot.java	84.61% <0.00%> (-15.39%)	⬇️
...ache/rocketmq/common/stats/MomentStatsItemSet.java	39.13% <0.00%> (-13.05%)	⬇️
.../apache/rocketmq/common/stats/MomentStatsItem.java	38.09% <0.00%> (-9.53%)	⬇️
...va/org/apache/rocketmq/common/stats/StatsItem.java	50.00% <0.00%> (-5.00%)	⬇️
...apache/rocketmq/remoting/netty/ResponseFuture.java	85.00% <0.00%> (-5.00%)	⬇️
...rocketmq/remoting/netty/NettyRemotingAbstract.java	46.88% <0.00%> (-4.03%)	⬇️
...lient/impl/consumer/DefaultMQPushConsumerImpl.java	39.47% <0.00%> (-2.29%)	⬇️
...rocketmq/client/impl/factory/MQClientInstance.java	51.30% <0.00%> (-2.00%)	⬇️
...he/rocketmq/client/trace/AsyncTraceDispatcher.java	78.21% <0.00%> (-1.49%)	⬇️
...nt/impl/consumer/ConsumeMessageOrderlyService.java	43.68% <0.00%> (-0.73%)	⬇️
... and 11 more

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