Revise page on security groups

[geoffcline]

Description

Revise the description of the security groups page.

Checklist

• n/a for docs updates

[geoffcline]

@oliviassss will you review this, please?

[k8s-ci-robot]

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[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (eacb0c3) 55.76% compared to head (b5b2a53) 55.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3415   +/-   ##
=======================================
  Coverage   55.76%   55.76%           
=======================================
  Files         149      149           
  Lines        8827     8827           
=======================================
  Hits         4922     4922           
  Misses       3571     3571           
  Partials      334      334           

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[geoffcline]

Thanks for the feedback @johngmyers ! I'm responding and revising now.