docs: correct typo in styling.md code snippet

[NazCodeland]

This pull request fixes a typo in the styling.md file. It updates the incorrect class name button to accordion-trigger, which is the correct global class defined in the app.css code snippet under Global Classes.

[changeset-bot]

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Latest commit: 62ca001

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[NazCodeland]

The contributions guide didn't mention whether creating an issue is required before submitting a pull request. I hope I'm not breaking any rules by skipping that step, but please let me know if I should create an issue next time.

[huntabyte]

Thank you!