Revert the conflict with other PR

docs/data/migration/migration-data-grid-v6/migration-data-grid-v6.md

@@ -14,15 +14,15 @@ To get started, check out [the blog post about the release of MUI X v6](https:/
 
 ## Start using the new release
 
-In `package.json`, change the version of the data grid package to `7.x.x`.
+In `package.json`, change the version of the data grid package to `next`.
 
 ```diff
 -"@mui/x-data-grid": "6.x.x",
-+"@mui/x-data-grid": "7.x.x",
++"@mui/x-data-grid": "next",
 -"@mui/x-data-grid-pro": "6.x.x",
-+"@mui/x-data-grid-pro": "7.x.x",
++"@mui/x-data-grid-pro": "next",
 -"@mui/x-data-grid-premium": "6.x.x",
-+"@mui/x-data-grid-premium": "7.x.x",
++"@mui/x-data-grid-premium": "next",
 ```
 
 Since v7 is a major release, it contains changes that affect the public API.
@@ -48,7 +48,7 @@ If you have `@mui/x-license-pro` in the `dependencies` section of your `package.
 
 ```diff
 -"@mui/x-license-pro": "6.x.x",
-+"@mui/x-license": "7.x.x",
++"@mui/x-license": "next",
 ```
 
 ## Run codemods