Updating Examples To Function Components & Hooks

Hi, I am new to react and was just going through the documentation. When, I discovered that most of the examples in the react documentation are outdated, they still use class instead of a function component.

Few Examples Of This :

https://reactjs.org/docs/forms.html
https://reactjs.org/docs/lifting-state-up.html

Also, I believe showing the integration of hooks in these examples, will be of much great help to beginners.

從 docs/forms.html 和 docs/lifting-state-up.html 中的範例開始，然後將它們與目前關於函式元件和 hooks 的文件慣例進行比較。更新已識別的範例，使其示範函式元件和 hooks，並確認這兩個頁面都不再依賴類別元件。