Wrong URL in function component documentation

[Madoshakalaka]

This is about:

• A typo
• Inaccurate/misleading documentation (e.g. technically incorrect advice)
• Undocumented code
• Outdated documentation
• Other

Problem

yew/packages/yew/src/functional/mod.rs

Line 21 in e7e2361

//! More details about function components and Hooks can be found on [Yew Docs](https://yew.rs/docs/next/concepts/function-components/introduction)

This hits 404

should really be https://yew.rs/docs/next/concepts/function-components/

Questionaire (Optional)

• I'd like to write this documentation
• I'd like to write this documentation but I'm not sure what's needed
• I don't have time to add this right now, but maybe later