add breadcrumb

Author: Deland-Han

articles/virtual-desktop/breadcrumb/TOC.yml

@@ -5,6 +5,9 @@
   - name: Virtual Desktop
     tocHref: /azure/virtual-desktop/
     topicHref: /azure/virtual-desktop/index
+  - name: Virtual Desktop
+    tocHref: /troubleshoot/azure/virtual-desktop/
+    topicHref: /azure/virtual-desktop/index
   - name: Virtual Desktop
     tocHref: /fslogix/
     topicHref: /azure/virtual-desktop/index