added DisplayName to TOC for storage insights

Author: MGoedtel

articles/azure-monitor/toc.yml

@@ -685,7 +685,7 @@
     - name: Storage
       items:
       - name: Azure Monitor for Storage
-        displayname: storage, monitor, insights, 
+        displayname: storage, monitor, insights, storage accounts, azure storage
         href: insights/storage-insights-overview.md
     - name: Databases
       items: