add note about permissions update (#45101)

docs/permissions/data.md

@@ -34,6 +34,8 @@ You can set the following types of permissions on a database, schema, or table:
 - [Manage table metadata](#manage-table-metadata-permissions)
 - [Manage database](#manage-database-permissions)
 
+> If you're upgrading from a version below Metabase 50, your permission levels may look different, but the data access hasn't changed. See [what's changed with data permissions and why](./no-self-service-deprecation.md).
+
 ## View data permissions
 
 The **View data** permission determines what data people can see. Permission levels include:

docs/permissions/no-self-service-deprecation.md

@@ -6,7 +6,7 @@ title: Migrating from legacy permissions
 
 In Metabase 50, we overhauled our data permissions system to make it more expressive and easier to reason about. This page explains what changed and why.
 
-The TL;DR: we split the old **Data access** setting into two settings: [View data](./data.md#can-view-data-permission) and [Create Queries](./data.md#create-queries-permissions).
+**The TL;DR: we split the old Data access setting into two settings: [View data](./data.md#can-view-data-permission) and [Create Queries](./data.md#create-queries-permissions). Your data permissions may look different, but the access hasn't changed.**
 
 ## How Metabase migrated your permissions