Update gc doc with vs listeners

[vepatel]

Proposed changes

• UpdateGlobalConfiguration doc with VirtualServer custom listeners

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 #4507 (e6efe5d) into main (aad4fc9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4507   +/-   ##
=======================================
  Coverage   51.95%   51.95%           
=======================================
  Files          59       59           
  Lines       16960    16960           
=======================================
  Hits         8811     8811           
  Misses       7852     7852           
  Partials      297      297           

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