update referenceCount log

[haiyang1985]

What is the purpose of the change

for Issue: #4682
This is not an issue, but the update of referenceCount log.

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[codecov-io]

Codecov Report

Merging #4683 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master    #4683     +/-   ##
===========================================
- Coverage     64.02%   63.93%   -0.1%     
+ Complexity      453      452      -1     
===========================================
  Files           769      769             
  Lines         33143    33143             
  Branches       5224     5224             
===========================================
- Hits          21219    21189     -30     
- Misses         9505     9523     +18     
- Partials       2419     2431     +12

Impacted Files	Coverage Δ	Complexity Δ
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	67.3% <ø> (ø)	0 <0> (ø)	⬇️
...c/protocol/dubbo/ReferenceCountExchangeClient.java	68.51% <ø> (ø)	0 <0> (ø)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-15.22%)	0% <0%> (ø)
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	69.23% <0%> (-12.83%)	0% <0%> (ø)
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	45.45% <0%> (-11.37%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	78.04% <0%> (-7.32%)	0% <0%> (ø)
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80% <0%> (-3.34%)	0% <0%> (ø)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	53.94% <0%> (-1.32%)	17% <0%> (-1%)
... and 3 more

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[manzhizhen]

good job