update documentation for -ingress-class

[vepatel]

Proposed changes

• Add more clarification around -ingress-class argument

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

Merging #4542 (ba334c2) into main (728a2f6) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4542      +/-   ##
==========================================
- Coverage   51.98%   51.96%   -0.03%     
==========================================
  Files          59       59              
  Lines       16965    16965              
==========================================
- Hits         8820     8816       -4     
- Misses       7850     7852       +2     
- Partials      295      297       +2     

see 1 file with indirect coverage changes

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