update toc - reference links

Author: cherylmc

articles/bastion/TOC.yml

@@ -40,6 +40,14 @@
     href: session-monitoring.md
   - name: Troubleshoot
     href: troubleshoot.md
+- name: Reference
+  items:
+  - name: Azure PowerShell
+    href: /powershell/module/az.network
+  - name: REST
+    href: /rest/api/virtualnetwork/bastionhosts
+  - name: Azure CLI
+    href: /cli/azure/network/bastion
 - name: Resources
   items:
   - name: Bastion FAQ