Merge pull request #249518 from duongau/patch-14

Front Door - FAQ - add question about afd behind another afd

Author: prmerger-automator[bot]

articles/frontdoor/front-door-faq.yml

@@ -161,6 +161,11 @@ sections:
         answer:  |
           Azure Front Door and Azure CDN can't be configured together because both services utilize the same Azure edge sites when responding to requests. 
 
+      - question: |
+          Can I configure Azure Front Door behind my Front Door profile or vice versa?
+        answer:  |
+          An Azure Front Door profile can't be configured behind another because both they utilize the same Azure edge sites when responding to requests. 
+
       - question: |
           Which network service tags does Front Door support?
         answer:  |