cleanup: fix docstring style

[purnesh42H]

RELEASE NOTES: None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.85%. Comparing base (11c44fb) to head (0f476dd).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7643      +/-   ##
==========================================
- Coverage   81.93%   81.85%   -0.08%     
==========================================
  Files         361      361              
  Lines       27816    27816              
==========================================
- Hits        22790    22769      -21     
- Misses       3837     3849      +12     
- Partials     1189     1198       +9     

Files with missing lines	Coverage Δ
internal/channelz/server.go	90.69% <ø> (ø)
internal/channelz/trace.go	92.15% <ø> (ø)
internal/testutils/stats/test_metrics_recorder.go	72.35% <ø> (ø)

... and 19 files with indirect coverage changes

[arvindbr8]

mmm, are these changes as part of #7444 ? Could you add more context to the description?

[purnesh42H]

mmm, are these changes as part of #7444 ? Could you add more context to the description?

no, just addressing some missed comments from #7575

[purnesh42H]

Another PR with a bigger change is taking care of these https://github.com/grpc/grpc-go/pull/7614/files#diff-f56c03af87bcc3c1a80cce06e2d7b3920126f4e971b1fd94d2928621d48189fc

Closing this to avoid merge conflicts