fix convertMethodConfig2AyncInfo spelling error

[leechor]

what the problem

rename convertMethodConfig2AyncInfo method name to convertMethodConfig2AsyncInfo

[beiwei30]

LGTM.

[codecov-io]

Codecov Report

Merging #4563 into master will increase coverage by 0.58%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #4563      +/-   ##
============================================
+ Coverage     62.38%   62.96%   +0.58%     
+ Complexity      450      449       -1     
============================================
  Files           791      770      -21     
  Lines         34853    33089    -1764     
  Branches       5457     5216     -241     
============================================
- Hits          21742    20835     -907     
+ Misses        10613     9860     -753     
+ Partials       2498     2394     -104

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/dubbo/config/AbstractConfig.java	79.87% <ø> (ø)	0 <0> (ø)	⬇️
.../java/org/apache/dubbo/config/ReferenceConfig.java	59.48% <100%> (-0.37%)	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)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-8.7%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyClientHandler.java	61.4% <0%> (-7.02%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	61.17% <0%> (-4.71%)	0% <0%> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.64% <0%> (-4.71%)	20% <0%> (-1%)
...pache/dubbo/registry/support/AbstractRegistry.java	78.54% <0%> (-3.07%)	0% <0%> (ø)
... and 27 more

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