[Typo]: Cannot debug the react source code through 'babel-standalone/dev.html' file

Summary

Follow this link to debug the react source code yet failed:
https://legacy.reactjs.org/docs/how-to-contribute.html

Steps:
1). Make no changes to main branch and just run the yarn build command
2). Open the fixtures/packaging/babel-standalone/dev.html file which includes your changes, but meet the errors from browser console as below:

GET file:///Users/quinvon/Documents/GitHub/react/build/oss-experimental/react/umd/react.development.js net::ERR_FILE_NOT_FOUND
dev.html:4 
        
        
       GET file:///Users/quinvon/Documents/GitHub/react/build/oss-experimental/react-dom/umd/react-dom.development.js net::ERR_FILE_NOT_FOUND
babel.js:61666 You are using the in-browser Babel transformer. Be sure to precompile your scripts for production - https://babeljs.io/docs/setup/
runScripts @ babel.js:61666
transformScriptTags @ babel.js:336
(anonymous) @ babel.js:327
Inline Babel script:2 Uncaught ReferenceError: ReactDOM is not defined

I think your debug way of source code is out of date!

Page

https://legacy.reactjs.org/docs/how-to-contribute.html

Details

No response

先从 legacy.reactjs.org/docs/how-to-contribute.html 中的贡献指南以及其中引用的 fixtures/packaging/babel-standalone/dev.html 文件开始，然后重现文档中记录的 yarn build 和浏览器控制台错误。完成的标准是，文档中的源码调试步骤与当前的构建输出一致，并且不再导致缺少 React 或 ReactDOM 文件。