Re-order callouts, kill what's next section

docs/data/material/migration/migration-v4/migration-v4.md

@@ -21,16 +21,16 @@ One of the biggest changes in v5 is the replacement of JSS for [Emotion](https:/
 Note that you may continue to use JSS for adding overrides to the components (e.g. `makeStyles`, `withStyles`) even after migrating to v5.
 Once you've completed the rest of the v5 upgrade, we recommend progressively moving over to the new styling engine.
 
-:::info
-If you are using Next.js and you are not sure how you should configure SSR to work with both emotion & JSS, take a look a this [example project](https://github.com/mui/material-ui/tree/master/examples/nextjs-with-typescript-v4-migration).
-:::
-
 This process is covered in [Migrating from JSS](/material-ui/migration/migrating-from-jss/).
 
 :::info
 Need to refer back to an older version of the docs? Check out [the v4 documentation here](https://v4.mui.com/).
 :::
 
+:::info
+If you are using Next.js and you are not sure how to configure SSR to work with both Emotion & JSS, take a look a this [example project](https://github.com/mui/material-ui/tree/master/examples/nextjs-with-typescript-v4-migration).
+:::
+
 ## Why you should migrate
 
 Material UI v5 includes many bug fixes and improvements over v4.

examples/nextjs-with-typescript-v4-migration/README.md

@@ -40,10 +40,3 @@ It demonstrates what results after handling v5's breaking changes to the [theme]
 Next.js has [a custom Link component](https://nextjs.org/docs/api-reference/next/link).
 The example folder provides adapters for usage with Material UI.
 You can find more information [in the documentation](https://mui.com/material-ui/guides/routing/#next-js).
-
-## What's next?
-
-<!-- #default-branch-switch -->
-
-You now have a working example project.
-You can head back to the documentation, continuing browsing it from the [templates](https://mui.com/material-ui/getting-started/templates/) section.