Added child item back in.

Author: Heidilohr

articles/virtual-desktop/breadcrumb/TOC.yml

@@ -4,4 +4,8 @@
   items:
   - name: Windows Virtual Desktop
     tocHref: /azure/virtual-desktop
-    topicHref: /azure/virtual-desktop/index
+    topicHref: /azure/virtual-desktop/index
+    items: 
+     - name: Reference
+       tocHref: /WindowsServerDocs/remote/remote-desktop-services/clients/rdp-files
+       topicHref: /azure/virtual-desktop/index