apis: update some comment

[lucming]

Ⅰ. Describe what this PR does

Modified some code comments to make it easier to understand.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (f3c7123) 66.53% compared to head (791cb38) 66.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1124      +/-   ##
==========================================
- Coverage   66.53%   66.53%   -0.01%     
==========================================
  Files         265      265              
  Lines       29362    29362              
==========================================
- Hits        19536    19535       -1     
+ Misses       8440     8438       -2     
- Partials     1386     1389       +3     

Flag	Coverage Δ
unittests	66.53% <ø> (-0.01%)	⬇️

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see 3 files with indirect coverage changes

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[jasonliu747]

/lgtm

[saintube]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FillZpp, jasonliu747

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• apis/OWNERS [FillZpp]
• config/OWNERS [jasonliu747]

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