Update TOC.yml

 Moved migration docs a step up in hierarchy. And also added How to doc for cluster upgrade.

Author: suvishodcitus

articles/cosmos-db/mongodb/vcore/TOC.yml

@@ -60,22 +60,22 @@
           href: security.md
         - name: Data encryption
           href: database-encryption-at-rest.md
+- name: Migrate data
+  items:
+    - name: Premigration assessment
+      href: how-to-assess-plan-migration-readiness.md
+    - name: Native tools
+      href: how-to-migrate-native-tools.md
+    - name: Azure Data Studio
+      href: /azure-data-studio/extensions/database-migration-for-mongo-extension 
 - name: How to
   items:
     - name: Use community tools
       items:
         - name: Connect using Studio 3T
           href: how-to-connect-studio-3t.md
         - name: Connect using MongoDB Shell
-          href: how-to-connect-mongo-shell.md
-    - name: Migrate data
-      items:
-        - name: Premigration assessment
-          href: how-to-assess-plan-migration-readiness.md
-        - name: Native tools
-          href: how-to-migrate-native-tools.md
-        - name: Azure Data Studio
-          href: /azure-data-studio/extensions/database-migration-for-mongo-extension        
+          href: how-to-connect-mongo-shell.md      
     - name: Develop applications
       items:
         - name: Create transactions
@@ -94,6 +94,8 @@
           href: how-to-create-text-index.md
     - name: Scale cluster
       href: how-to-scale-cluster.md
+    - name: Upgrade cluster
+      href: how-to-upgrade-cluster.md
     - name: Restore cluster
       href: how-to-restore-cluster.md
     - name: Manage replication