Update private-link.md

Author: Harikrishnan-M-B

articles/frontdoor/private-link.md

@@ -113,6 +113,8 @@ Origin support for direct private endpoint connectivity is currently limited to:
 * Internal load balancers, or any services that expose internal load balancers such as Azure Kubernetes Service, Azure Container Apps or Azure Red Hat OpenShift
 * Storage Static Website
 
+> [!NOTE]
+> This feature is not supported with App Service Slots and Functions
 
 The Azure Front Door Private Link feature is region agnostic but for the best latency, you should always pick an Azure region closest to your origin when choosing to enable Azure Front Door Private Link endpoint.