finalize migration guide

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

@@ -10,7 +10,7 @@ productId: x-charts
 
 This is a reference guide for upgrading `@mui/x-charts` from v6 to v7.
 The change between v6 and v7 is mostly here to match the version with other MUI X packages.
-Not big breaking changes are expected.
+No big breaking changes are expected.
 
 ## Start using the new release
 

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

@@ -8,9 +8,10 @@ productId: x-data-grid
 
 <p class="description">This guide describes the changes needed to migrate the Data Grid from v6 to v7.</p>
 
-<!-- ## Introduction
+## Introduction
 
-To get started, check out [the blog post about the release of MUI X v6](https://mui.com/blog/mui-x-v6/). -->
+This is a reference guide for upgrading `@mui/x-data-grid` from v6 to v7.
+To read more about the changes from the new major, check out [the blog post about the release of MUI X v7](https://mui.com/blog/mui-x-v7-beta/).
 
 ## Start using the new release
 

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

@@ -10,7 +10,8 @@ productId: x-date-pickers
 
 ## Introduction
 
-TBD
+This is a reference guide for upgrading `@mui/x-date-pickers` from v6 to v7.
+To read more about the changes from the new major, check out [the blog post about the release of MUI X v7](https://mui.com/blog/mui-x-v7-beta/).
 
 ## Start using the new release
 

docs/data/migration/migration-tree-view-v6/migration-tree-view-v6.md

@@ -10,7 +10,8 @@ productId: x-tree-view
 
 ## Introduction
 
-TBD
+This is a reference guide for upgrading `@mui/x-tree-view` from v6 to v7.
+To read more about the changes from the new major, check out [the blog post about the release of MUI X v7](https://mui.com/blog/mui-x-v7-beta/).
 
 ## Start using the beta release