[Joy] Add radio button documentation

[siriwatknp]

Preview: https://deploy-preview-33254--material-ui.netlify.app/joy-ui/react-radio-button/

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

[mui-bot]

Details of bundle changes

@mui/joy: parsed: +0.19% , gzip: +0.19%

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[siriwatknp]

@danilo-leal I moved RadioGroup and Controlled demos up because they are more common than Position.

[danilo-leal]

I figured that but I'd say it's good to follow the flow of simple → complex on the documentation. As the RadioGroup is already an aggregator component for more complex layouts, position made sense to come in first. What do you think?

[siriwatknp]

I figured that but I'd say it's good to follow the flow of simple → complex on the documentation. As the RadioGroup is already an aggregator component for more complex layouts, position made sense to come in first. What do you think?

I agree completely with simple → complex. That's why I move the RadioGroup up because I'd say that it is the most simple one (it is more common to use RadioGroup rather than a single Radio).

The layouts and position come later (not every app needs them).

[danilo-leal]

That makes sense but then it's a different rationale, isn't it?
Simple to complex as opposed to more frequently used to less frequently used.
I'd still follow the first one!

[siriwatknp]

That makes sense but then it's a different rationale, isn't it?

Simple to complex as opposed to more frequently used to less frequently used.

I'd still follow the first one!

That's true. I will revert the change then.