Fix drift in Prometheus documentation related to ServiceMonitor

[ADubhlaoich]

Proposed changes

Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to
that issue here in this description (not in the title of the PR).

Checklist

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• 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

All modified and coverable lines are covered by tests ✅

Comparison is base (4c1eef7) 52.06% compared to head (435a1d7) 52.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4755      +/-   ##
==========================================
+ Coverage   52.06%   52.09%   +0.02%     
==========================================
  Files          59       59              
  Lines       17033    17033              
==========================================
+ Hits         8869     8873       +4     
+ Misses       7864     7862       -2     
+ Partials      300      298       -2     

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