Update functions-create-function-app-portal.md

This is related to internal email titles "Is it possible to use "Test/Run" in the Portal to Run a Function if it has Private Endpoint enabled?" discussed over the Azure Functions Discussions email alias. The include file has been submitted here:  [206911](MicrosoftDocs/azure-docs-pr#206911)

Author: benperk

articles/azure-functions/functions-create-function-app-portal.md

@@ -48,6 +48,8 @@ Next, create a function in the new function app.
 1. Under **Template details** use `HttpExample` for **New Function**, select **Anonymous** from the **[Authorization level](functions-bindings-http-webhook-trigger.md#authorization-keys)** drop-down list, and then select **Create**.
 
     Azure creates the HTTP trigger function. Now, you can run the new function by sending an HTTP request.
+    
+    [!INCLUDE [functions-create-function-app-portal-private-endpoint](../../includes/functions-create-function-app-portal-private-endpoint.md)]
 
 ## Test the function