Add clarifying comment to service template

[sjberman]

Problem: There has been some confusion around the NGF service that gets deployed at installation time.

Solution: Clarify that this is NOT the NGINX Service.

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

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (668d4fb) to head (1d346bb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4321      +/-   ##
==========================================
- Coverage   86.08%   86.07%   -0.02%     
==========================================
  Files         132      132              
  Lines       14342    14342              
  Branches       35       35              
==========================================
- Hits        12347    12345       -2     
- Misses       1791     1792       +1     
- Partials      204      205       +1     

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