update howto-deploy-java-liberty-app guide

Signed-off-by: Jianguo Ma <[email protected]>

Author: majguo

articles/aks/howto-deploy-java-liberty-app.md

@@ -22,6 +22,8 @@ For more information on Open Liberty, see [the Open Liberty project page](https:
 
 This article uses the Azure Marketplace offer for Open/WebSphere Liberty to accelerate your journey to AKS. The offer automatically provisions a number of Azure resources including an Azure Container Registry (ACR) instance, an AKS cluster, an Azure App Gateway Ingress Controller (AGIC) instance, the Liberty Operator, and optionally a container image including Liberty and your application. To see the offer, visit the [Azure portal](https://aka.ms/liberty-aks). If you prefer manual step-by-step guidance for running Liberty on AKS that doesn't utilize the automation enabled by the offer, see [Manually deploy a Java application with Open Liberty or WebSphere Liberty on an Azure Kubernetes Service (AKS) cluster](/azure/developer/java/ee/howto-deploy-java-liberty-app-manual).
 
+This article is intended to help you quickly get to deployment. Before going to production, you should explore [Tuning Liberty](https://www.ibm.com/docs/en/was-liberty/base?topic=tuning-liberty).
+
 [!INCLUDE [quickstarts-free-trial-note](../../includes/quickstarts-free-trial-note.md)]
 
 [!INCLUDE [azure-cli-prepare-your-environment.md](~/articles/reusable-content/azure-cli/azure-cli-prepare-your-environment.md)]
@@ -110,7 +112,7 @@ There are a few samples in the repository. We'll use *java-app/*. Here's the fil
 ```azurecli-interactive
 git clone https://github.com/Azure-Samples/open-liberty-on-aks.git
 cd open-liberty-on-aks
-git checkout 20230723
+git checkout 20230830
 ```
 
 If you see a message about being in "detached HEAD" state, this message is safe to ignore. It just means you have checked out a tag.
@@ -274,6 +276,8 @@ The following steps deploy and test the application.
       echo $APP_URL
       ```
 
+      If the web page isn't loaded correctly or it shows `502 Bad Gateway`, that's because the app is starting. You can wait for a while and refresh the web page later.
+
 ## Clean up resources
 
 To avoid Azure charges, you should clean up unnecessary resources. When the cluster is no longer needed, use the [az group delete](/cli/azure/group#az-group-delete) command to remove the resource group, container service, container registry, and all related resources.