fix/migration 3p11 (#5370)

platform/docs/versioned_docs/version-3.11/migration-guide/3p8-to-3p9/index.md

@@ -0,0 +1,14 @@
+---
+id: 3p8-to-3p9
+title: 3.8 -> 3.9
+sidebar_position: 2
+summary: Migration guide for upgrading from OHIF 3.8 to 3.9, covering segmentation architecture changes, renamings, data sources, measurements, viewport action corners, state sync service, RT structure improvements, UI changes, and other refactorings.
+---
+
+
+import DocCardList from '@theme/DocCardList';
+import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
+
+## Migration Guide Sections
+
+<DocCardList items={useCurrentSidebarCategory().items}/>