Add comment to clarify non-f-functions on golang standard lib

[ahrtr]

Followup to #18741

Refer to #18741 (comment)

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.81%. Comparing base (bb381d4) to head (1e2c07a).

❗ Current head 1e2c07a differs from pull request most recent head 9060226

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Additional details and impacted files

see 26 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18766      +/-   ##
==========================================
+ Coverage   68.68%   68.81%   +0.13%     
==========================================
  Files         420      420              
  Lines       35504    35504              
==========================================
+ Hits        24385    24432      +47     
+ Misses       9685     9645      -40     
+ Partials     1434     1427       -7     

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[ahrtr]

/test pull-etcd-integration-1-cpu-amd64

[ahrtr]

/test pull-etcd-integration-1-cpu-amd64

[ivanvc]

LGTM. Thanks, Ben.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, mmorel-35

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