Merge branch 'aca/certificate-updates' of https://github.com/craigshoemaker/azure-docs-pr into aca/certificate-updates

Author: craigshoemaker

articles/container-apps/certificates-overview.md

@@ -26,4 +26,4 @@ The following table lists the options available to manage certificates in Contai
 ## Next steps
 
 > [!div class="nextstepaction"]
-> [Certificates from Key Vault](custom-domains-certificates.md)
+> [Custom domain names and free managed certificates(custom-domains-managed-certificates.md)

articles/container-apps/key-vault-certificates-manage.md

@@ -17,16 +17,10 @@ You can set up Azure Key Vault to manage your container app's certificates to ha
 
 - [Azure Key Vault](/azure/key-vault/): Make sure you have a certificate stored in Azure Key Vault.
 
-- [Azure CLI](/cli/azure/install-azure-cli): You need the Azure CLI updated with the Azure Container Apps extension version `0.3.49` or higher. Use the `list-available` command to view your extension's version number.
+- [Azure CLI](/cli/azure/install-azure-cli): You need the Azure CLI updated with the Azure Container Apps extension version `0.3.49` or higher. Use the `az extension add` command to install the latest version.
 
     ```azurecli
-    az extension list-available --output table | findstr containerapp
-    ```
-
-    If you need to upgrade your extension, then use the `upgrade` parameter with the `add` command:
-
-    ```azurecli
-    az extension add --name containerapp --upgrade`
+    az extension add --name containerapp --upgrade --allow-preview`
     ```
 
 - [Managed identity](./managed-identity.md): Enable managed identity on your Container Apps environment.