Feature request: add a functional version of the example code

With the increasing adoption of functional components and React hooks (including now its support in recent versions of the Expo SDK) it would be great if the there's an option to view a functional version of the code examples in the documentation.
(Such as in this page, at the bottom: https://reactnative.dev/docs/next/backhandler)
More and more projects no longer use class-based components and the conversion can troublesome specially for less experienced developers.
Note: I'm using version 4 of the docs

从 issue 中链接的 BackHandler 文档页面开始，查看其中的示例代码及周围的文档。完成的标准是，相关文档在现有的基于类的版本旁边提供一个使用 functional-components 和 hooks 的示例版本。