Document using stylelint inside npm-scripts

[jeddy3]

Which issue, if any, is this issue related to?

Closes #6395

Is there anything in the PR that needs further explanation?

As an aside, GitHub copilot wrote the example after I typed "if you are using npm scripts...". Was kinda cool to see 😆

[changeset-bot]

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Latest commit: 6a9d611

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[ybiquitous]

Thanks, LGTM!