[docs][joy-ui] Add ref usage instructions on the Textarea page

[luv2027]

Fixes #39187

This PR adds a Textarea-ref in the Joy UI docs (/docs/joy/components/textarea/textarea.md).
It's usually more common to see textarea components using decorators at the top.

👉 https://deploy-preview-39277--material-ui.netlify.app/joy-ui/react-textarea/#textarea-ref

[mui-bot]

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• docs/data/joy/components/textarea/textarea.md

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[danilo-leal]

Thanks for putting effort in to adding this to the docs! 🙌 Left a few copywriting and demo styling-related points there.

[danilo-leal]

@luv2027 some tests are failing due to different reasons! I'd advise you to click on "Details" for each of them and see the instructions for how to fix it (they all should have some indication)!

[luv2027]

@luv2027 some tests are failing due to different reasons! I'd advise you to click on "Details" for each of them and see the instructions for how to fix it (they all should have some indication)!

I am not able to get what is the real issue is ? I tried to do stack overflow but still I am not able to resolve the issue. Can you please help me figure it out ?

[danilo-leal]

@luv2027 not sure either! But try fixing the others first, commit, and then see if this one persists!

[siriwatknp]

👍 Thanks for kickstarting the improvement! I adjusted the content a bit to focus on the textarea ref instead of useRef.

[luv2027]

Is there anything needs to be done to get pr merged ?

[danilo-leal]

@siriwatknp the tests keep failing on this one, and it seems auth-related? Not sure how to solve them... mind taking a quick look?

[danilo-leal]

@luv2027 thanks for your work here! I ended up creating an identical PR as this because the checks kept failing due to some strange auth problem. Will close this one now but I appreciate your effort and please keep contributing! 😃

[luv2027]

@danilo-leal Thank you so much for giving credits!! Hoping to contribute more often in this repo..