Fix description of the format.skip-magic-trailing-comma example

[LeanderCS]

Summary

This PR fixes a typo in the docs, where both variants of a config have the same description.

[ntBre]

Thanks, this looks good! I think you'll just need to run

cargo dev generate-all

to update the schema and pass the CI tests. Or I can do that for you if you prefer :)

[ntBre]

Thank you!

[github-actions]

ruff-ecosystem results

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✅ ecosystem check detected no linter changes.

Linter (preview)

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