update title

Author: duongau

articles/frontdoor/TOC.yml

@@ -118,8 +118,8 @@
     href: front-door-diagnostics.md
   - name: Troubleshoot
     items:
-    - name: Troubleshoot routing issues
-      href: front-door-troubleshoot-routing.md
+    - name: Troubleshooting Front Door issues
+      href: troubleshoot-issues.md
     - name: Allowed certificate authorities
       href: https://ccadb-public.secure.force.com/microsoft/IncludedCACertificateReportForMSFT
 - name: Reference

articles/frontdoor/troubleshoot-issues.md

@@ -1,5 +1,5 @@
 ---
-title: Troubleshoot Azure Front Door issues
+title: Troubleshoot Azure Front Door common issues
 description: In this tutorial, you'll learn how to troubleshoot some of the common problems that you might face for your Azure Front Door instance.
 services: frontdoor
 author: duongau
@@ -9,7 +9,7 @@ ms.date: 11/12/2021
 ms.author: duau
 ---
 
-# Troubleshooting common issues with Azure Front Door
+# Troubleshoot Azure Front Door common issues
 
 This article describes how to troubleshoot common routing problems that you might face for your Azure Front Door configuration.