[Docs] Babel package names are outdated

Currently, on the page Add React to a Website in the section "Add JSX to a Project", the instructions are to run

npm install babel-cli@6 babel-preset-react-app@3

These packages have been renamed @babel/cli and @babel/preset-react, respectively, so this should be updated.

I believe the next command with --presets react-app/prod should also be changed to --presets @babel/preset-react.

Thank you!

先检查链接的 pull request #4624，然后打开“向项目添加 JSX”部分所在的“向网站添加 React”页面。更新过时的软件包名称和 --presets 命令，然后验证文档显示的是当前的 Babel 软件包名称。