Documentation about Keys beyond usage in lists

The You Probably Don't Need Derived State post shows a pattern that uses the key prop to reset (force remount) elements in order to restart the component lifecycle: https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#recommendation-fully-uncontrolled-component-with-a-key

It would be good to expand on that example in the main docs and discuss some of the pitfalls of that approach (for example, if a component is not written to account for changing data sources, the consumer must add a key to correctly reset the component).

從連結的「You Probably Don’t Need Derived State」文章及其使用 key 的完全非受控元件範例開始。在 React 主要文件的相關章節中加入一個可比較的範例，並說明重設行為以及變更資料來源時可能遇到的問題；當讀者能清楚理解其用法和注意事項時，即視為完成。