[docs][base-ui] Fix form submission Select demo

[ZeeshanTamboli]

• I have followed (at least) the PR section of the contributing guide.

The form submission demo appears incorrect to me. It was added in #34638, but it lacks a form HTML element. Additionally, the statement "When the name prop is set, the Select will render a hidden input with the selected value." is incorrect because the hidden input is always rendered.

I've also removed the sentence in the documentation that reads:

Note how the second Select in the demo above renders a hidden input with the name provided as a prop.

and retained one demo with a form and a submit button.

Preview - https://deploy-preview-40014--material-ui.netlify.app/base-ui/react-select/#form-submission.

[mui-bot]

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• docs/data/base/components/select/select.md

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[michaldudak]

Thanks for the fix! The unconditional rendering of the hidden input was introduced at some point, but apparently the docs were not updated.

[ZeeshanTamboli]

@michaldudak, I noticed that the name prop description for Base UI and Joy UI includes the sentence:

"If the name is provided, the component will render a hidden input element that can be submitted to a server."

Should we consider removing it? Also, useSelect's name prop description is different and doesn't contain the mentioned sentence - https://mui.com/base-ui/react-select/hooks-api/#use-select-parameters-name.

[michaldudak]

Yes, it's no longer true. Let's remove it.

[ZeeshanTamboli]

Yes, it's no longer true. Let's remove it.

@michaldudak Done.