Update app-routing.md

Author: sabbour

articles/aks/app-routing.md

@@ -29,7 +29,7 @@ For other configurations, see:
 * [Application routing add-on configuration][custom-ingress-configurations]
 * [Configure internal NGIX ingress controller for Azure private DNS zone][create-nginx-private-controller].
 
-With the retirement of [Open Service Mesh][open-service-mesh-docs] (OSM) by the Cloud Native Computing Foundation (CNCF), using the application routing add-on is the default method for all AKS clusters.
+With the retirement of [Open Service Mesh][open-service-mesh-docs] (OSM) by the Cloud Native Computing Foundation (CNCF), using the application routing add-on with OSM is not recommended.
 
 ## Prerequisites
 
@@ -42,7 +42,7 @@ With the retirement of [Open Service Mesh][open-service-mesh-docs] (OSM) by the
 - The application routing add-on supports up to five Azure DNS zones.
 - All global Azure DNS zones integrated with the add-on have to be in the same resource group.
 - All private Azure DNS zones integrated with the add-on have to be in the same resource group.
-- Editing any resources in the `app-routing-system` namespace, including the Ingress-nginx ConfigMap, isn't supported.
+- Editing the ingress-nginx `ConfigMap` in the `app-routing-system` namespace isn't supported.
 
 ## Enable application routing using Azure CLI