Updated TOC

Author: anfeldma-ms

articles/cosmos-db/TOC.yml

@@ -980,9 +980,11 @@
       - name: Troubleshoot query performance
         href: troubleshoot-query-performance.md
       - name: Troubleshoot Java SDK v4
-        href: troubleshoot-java-sdk-v4-sql.md        
-      - name: Troubleshoot Java Async SDK v2
-        href: troubleshoot-java-async-sdk.md
+        href: troubleshoot-java-sdk-v4-sql.md  
+      - name: Troubleshoot older Java SDKs
+        items:
+        - name: Async Java SDK v2
+          href: troubleshoot-java-async-sdk.md
       - name: Troubleshoot .NET SDK
         href: troubleshoot-dot-net-sdk.md
     - name: Change Feed