doc: documented SkipAuth feature with build tag

[fredbi]

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.23%. Comparing base (af192a9) to head (239e690).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
- Coverage   83.30%   83.23%   -0.07%     
==========================================
  Files          64       64              
  Lines        4516     4516              
==========================================
- Hits         3762     3759       -3     
- Misses        583      585       +2     
- Partials      171      172       +1     

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