includesModifiedFile policy test - 1 file

[gewarren]

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

[dotnet-policy-service]

@gewarren - This PR edits one or more files whose 'source of truth' for documentation is not in this repo. To see which files are affected, look in the .github/policies/disallow-edits.yml file. Please make documentation updates for these assemblies in the /// comments in the source repo (either dotnet/runtime or dotnet/extensions) instead.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[learn-build-service-prod]

Learn Build status updates of commit 1a3dd48:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Formats.Nrbf/NrbfDecoder.xml	✅Succeeded	View

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