Test - Update JsonConfigurationSource.xml

[gewarren]

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

[dotnet-policy-service]

@gewarren - This PR edits files whose 'source of truth' for documentation is not in this repo. If you're editing the documentation, please make these updates in the /// comments in the source repo (either dotnet/runtime or dotnet/extensions) instead.

[ghost]

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.

[ghost]

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 1c0506d:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/Microsoft.Extensions.Configuration.Json/JsonConfigurationSource.xml	✅Succeeded	View

For more details, please refer to the build report.

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