Updated the Reference section

Author: BanoFarha

articles/azure-arc/system-center-virtual-machine-manager/toc.yml

@@ -60,13 +60,9 @@
       href: /cli/azure/scvmm
     - name: Azure Arc resource bridge
       href:  /cli/azure/arcappliance
-  - name: Azure PowerShell
-    items:
-    - name: Azure Arc-enabled System Center VMM
-      href: /powershell/module/az.connectedscvmm/
   - name: REST API
     items:
     - name: Azure Arc-enabled SCVMM REST API reference
-      href: /rest/api/azure-arc-scvmm/
+      href: /rest/api/azure-arc-scvmm/operation-groups