Add note about enable-addons to enable Http Application Routing

Author: ghogen

articles/dev-spaces/includes/portal-aks-cluster.md

@@ -37,7 +37,7 @@ manager: douge
 
    ![Enable Http Application Routing](../media/common/Kubernetes-Create-Cluster-3.PNG)
 
-    > [!IMPORTANT]
-    > You must be sure to enable Http Application Routing when you create your AKS cluster. It is not possible to change this setting later.
+> [!Note]
+> To enable [Http Application Routing](/azure/aks/http-application-routing) on an existing cluster, use the command: `az aks enable-addons --resource-group myResourceGroup --name myAKSCluster --addons http_application_routing`
 
 1. Select **Review + create** and then **Create** when complete.

articles/dev-spaces/quickstart-netcore.md

@@ -30,6 +30,9 @@ In this guide, you will learn how to:
 
   ![Be sure to enable Http Application Routing.](media/common/Kubernetes-Create-Cluster-3.PNG)
 
+> [!Note]
+> To enable [Http Application Routing](/azure/aks/http-application-routing) on an existing cluster, use the command: `az aks enable-addons --resource-group myResourceGroup --name myAKSCluster --addons http_application_routing`
+
 - [Visual Studio Code](https://code.visualstudio.com/download).
 
 ## Set up Azure Dev Spaces

articles/dev-spaces/quickstart-nodejs.md

@@ -30,6 +30,9 @@ In this guide, you will learn how to:
 
   ![Be sure to enable Http Application Routing.](media/common/Kubernetes-Create-Cluster-3.PNG)
 
+> [!Note]
+> To enable [Http Application Routing](/azure/aks/http-application-routing) on an existing cluster, use the command: `az aks enable-addons --resource-group myResourceGroup --name myAKSCluster --addons http_application_routing`
+
 - Visual Studio Code, which you can download [here](https://code.visualstudio.com/download).
 
 ## Set up Azure Dev Spaces