Fix #1539, change log method

[diecui1202]

What is the purpose of the change

Just fix hand-writing error for warn log

Brief changelog

XX

Verifying this change

All unit test are pass.

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[codecov-io]

Codecov Report

Merging #1578 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1578      +/-   ##
============================================
+ Coverage     34.52%   34.53%   +<.01%     
- Complexity     3684     3685       +1     
============================================
  Files           621      621              
  Lines         30875    30875              
  Branches       5448     5448              
============================================
+ Hits          10661    10663       +2     
  Misses        18376    18376              
+ Partials       1838     1836       -2

Impacted Files	Coverage Δ	Complexity Δ
...pc/cluster/support/wrapper/MockClusterInvoker.java	62.5% <100%> (ø)	10 <0> (ø)	⬇️
...a/dubbo/remoting/transport/netty/NettyChannel.java	62.5% <0%> (-3.75%)	20% <0%> (-1%)
...ba/dubbo/remoting/transport/netty/NettyServer.java	70.9% <0%> (+3.63%)	9% <0%> (+1%)	⬆️
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	55.69% <0%> (+3.79%)	13% <0%> (+2%)	⬆️

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