Update example spec comment for GlobalConfiguration in helm values.yaml

[shaun-nx]

Proposed changes

This change updates the example comment for the controller.globalConfiguration.spec field in deployments/helm-chart/values.yaml to provide more clarity on the exact format for adding listeners.

Resolves #4284

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 #4285 (550ba66) into main (05ba01b) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4285      +/-   ##
==========================================
- Coverage   52.19%   52.17%   -0.03%     
==========================================
  Files          59       59              
  Lines       16930    16930              
==========================================
- Hits         8837     8833       -4     
- Misses       7796     7798       +2     
- Partials      297      299       +2     

see 1 file with indirect coverage changes

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