Update selinux readme

[dhurley]

Proposed changes

Update selinux readme

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.29% ⚠️

Comparison is base (7c1ada3) 67.19% compared to head (31cb796) 66.90%.
Report is 13 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #449      +/-   ##
==========================================
- Coverage   67.19%   66.90%   -0.29%     
==========================================
  Files         113      113              
  Lines       12849    12931      +82     
==========================================
+ Hits         8634     8652      +18     
- Misses       3647     3707      +60     
- Partials      568      572       +4     

Files Changed	Coverage Δ
...or/github.com/nginx/agent/sdk/v2/config_helpers.go	64.19% <50.00%> (+0.18%)	⬆️

... and 7 files with indirect coverage changes

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