update afd include file

Author: duongau

includes/front-door-classic-retirement.md

@@ -10,4 +10,4 @@
  ms.custom: include file
 ---
 > [!IMPORTANT]
-> Azure Front Door (classic) will be retired on **March 31, 2027**. To avoid any service disruption, it is important that you migrate your Azure Front Door (classic) profiles to Azure Front Door Standard or Premium tier by March 2027. For detailed information, see [**Azure Front Door (classic) retirement**]().
+> Azure Front Door (classic) will be retired on **March 31, 2027**. To avoid any service disruption, it is important that you [**migrate your Azure Front Door (classic) profiles**](../articles/frontdoor/migrate-tier.md) to Azure Front Door Standard or Premium tier by March 2027. For detailed information, see [**Azure Front Door (classic) retirement**]().