fix spell

[niujialin]

fix spelling error with executor

from #3724

[codecov-io]

Codecov Report

Merging #3750 into master will increase coverage by 0.03%.
The diff coverage is 75%.

@@             Coverage Diff              @@
##             master    #3750      +/-   ##
============================================
+ Coverage     63.55%   63.59%   +0.03%     
  Complexity       71       71              
============================================
  Files           704      704              
  Lines         31069    31069              
  Branches       5037     5037              
============================================
+ Hits          19746    19758      +12     
+ Misses         9050     9037      -13     
- Partials       2273     2274       +1

Impacted Files	Coverage Δ	Complexity Δ
.../dispatcher/execution/ExecutionChannelHandler.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../dispatcher/message/MessageOnlyChannelHandler.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...er/connection/ConnectionOrderedChannelHandler.java	69.04% <100%> (ø)	0 <0> (ø)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	57.14% <100%> (ø)	0 <0> (ø)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
...bo/rpc/cluster/support/FailbackClusterInvoker.java	67.21% <0%> (-3.28%)	0% <0%> (ø)
.../exchange/support/header/HeaderExchangeServer.java	69.81% <0%> (+1.88%)	0% <0%> (ø)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	53.94% <0%> (+10.52%)	0% <0%> (ø)	⬇️
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	56.81% <0%> (+11.36%)	0% <0%> (ø)	⬇️

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[beiwei30]

LGTM.