Update DuotonePicker docs for accuracy

[madalingorbanescu]

Description

Fixes the DuotonePicker docs.

• Added missing , for DUOTONE_PALETTE objects properties.
• Replaced COLOR_PALETTE colors property to color according to the API.

[github-actions]

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[ajlende]

Thanks for the fix! It looked like the color in the color palette should also just be a string, so I added a commit for that.

[github-actions]

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[getsource]

Thanks so much @madalingorbanescu and @ajlende !