Typo in getting-started-arduino.md

[Ryan-Awad]

What This PR Changes

I found a typo in getting-started-arduino.md

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[CLAassistant]

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[jhansson-ard]

@Ryan-Awad thank you for your contribution! If you could just sign the CLA and check the box in the PR description, we can approve and merge this PR ⭐

[jhansson-ard]

LGTM