enhance doc

[eeliu]

Describe your changes

Enchance the documents

[codecov]

Codecov Report

Attention: 92 lines in your changes are missing coverage. Please review.

Comparison is base (9496d50) 76.64% compared to head (6e99fd3) 81.34%.
Report is 32 commits behind head on dev.

Files	Patch %	Lines
common/src/common.cpp	73.00%	44 Missing ⚠️
common/src/ConnectionPool/TransLayer.h	66.34%	35 Missing ⚠️
common/src/Context/ContextType.h	58.33%	5 Missing ⚠️
common/src/ConnectionPool/TransLayer.cpp	85.18%	4 Missing ⚠️
common/src/Logging.cpp	85.71%	2 Missing ⚠️
common/src/NodePool/PoolManager.cpp	92.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #565      +/-   ##
==========================================
+ Coverage   76.64%   81.34%   +4.70%     
==========================================
  Files          18       18              
  Lines        1032     1067      +35     
==========================================
+ Hits          791      868      +77     
+ Misses        241      199      -42     

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