docs: update contribution guide

[AllanZhengYP]

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[codecov-commenter]

Codecov Report

Merging #1527 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1527      +/-   ##
==========================================
- Coverage   79.80%   79.67%   -0.14%     
==========================================
  Files         298      300       +2     
  Lines       11502    11653     +151     
  Branches     2475     2486      +11     
==========================================
+ Hits         9179     9284     +105     
- Misses       2323     2369      +46     

Impacted Files	Coverage Δ
...l_tests/aws-json/commands/EmptyOperationCommand.ts	90.00% <0.00%> (-10.00%)	⬇️
...ts/aws-query/commands/NoInputAndNoOutputCommand.ts	90.00% <0.00%> (-10.00%)	⬇️
.../aws-restxml/commands/NoInputAndNoOutputCommand.ts	90.00% <0.00%> (-10.00%)	⬇️
...aws-restjson/commands/NoInputAndNoOutputCommand.ts	90.00% <0.00%> (-10.00%)	⬇️
protocol_tests/aws-ec2/commands/XmlBlobsCommand.ts	95.00% <0.00%> (-5.00%)	⬇️
protocol_tests/aws-ec2/commands/XmlEnumsCommand.ts	95.00% <0.00%> (-5.00%)	⬇️
protocol_tests/aws-ec2/commands/XmlListsCommand.ts	95.00% <0.00%> (-5.00%)	⬇️
...rotocol_tests/aws-query/commands/XmlMapsCommand.ts	95.00% <0.00%> (-5.00%)	⬇️
...otocol_tests/aws-query/commands/XmlBlobsCommand.ts	95.00% <0.00%> (-5.00%)	⬇️
...otocol_tests/aws-query/commands/XmlEnumsCommand.ts	95.00% <0.00%> (-5.00%)	⬇️
... and 126 more

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