[Suggestion]: Make better use of ref in the last challenge of the docs

[Spoof14]

Summary

Remove useless useState and simply use ref

Page

No response

Details

The docs in the 4th challenge suggest using both a useState and a ref for managing the value of a component when there is a delay. This is unnecesarry and we can simply use the ref. https://react.dev/learn/referencing-values-with-refs#challenges

[Spoof14]

5485 https://github.com/reactjs/react.dev/pull/5485/files