Merge pull request #4276 from a-terho/patch-2

typo: index.jsx to main.jsx

Author: mluukkai

src/content/7/en/part7b.md

@@ -82,7 +82,7 @@ Let us now create a simple React app with the following directory structure:
 ├── dist
 │   └── index.html
 ├── src
-│   ├── index.jsx
+│   ├── main.jsx
 │   └── App.jsx
 └── package.json
 ```