Updated TOC for 2309 release notes

Author: LouisBerner

articles/databox-online/TOC.yml

@@ -525,7 +525,9 @@
         href: azure-stack-edge-contact-microsoft-support.md 
   - name: Shared release notes
     items:
-    - name: 2304 - Current
+    - name: 2309 - Current
+      href: azure-stack-edge-gpu-2309-release-notes.md
+    - name: 2304
       href: azure-stack-edge-gpu-2304-release-notes.md
     - name: 2303
       href: azure-stack-edge-gpu-2303-release-notes.md