[📖] add docs for useId

[shairez]

Suggestion

We need to document the useId api.

@n8sabes - do you think it's feasible to throw a quick doc (using chatgpt based on #2468) for this API ?

If you don't have time that's cool, but you're the obvious first person as you're the great magician who implemented it :)

At any case, thanks! 🙏

[gioboa]

@n8sabes if for you it's ok I will create the doc section for this. Let me know.

[n8sabes]

@gioboa, Thanks for prodding me on this issue. I have something written up and will submit a PR this weekend. I was thinking about putting it just after Component>Overview just after Getting hold of DOM element -- what do you guys think?

[gioboa]

After ref description sounds good to me