docs: update to next version [BUMP BETA] (#4493)

platform/docs/versioned_docs/version-3.9/migration-guide/index.md

@@ -0,0 +1,13 @@
+---
+id: index
+---
+
+
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+# Migration Guides
+
+Based on the version you are migrating from, you can find the migration guide for the latest version of the platform.
+
+<DocCardList items={useCurrentSidebarCategory().items}/>