update istio version info

Signed-off-by: tjons <[email protected]>

docs/content/envoy-tutorial-istio.md

@@ -16,9 +16,12 @@ This tutorial requires Kubernetes 1.20 or later. To run the tutorial locally ens
 version 1.20+, we recommend using [minikube](https://kubernetes.io/docs/getting-started-guides/minikube) or
 [KIND](https://kind.sigs.k8s.io/).
 
-The tutorial also requires Istio v1.9.0 or later. It assumes you have Istio deployed on top of Kubernetes.
+The tutorial also requires Istio v1.19.0 or later. It assumes you have Istio deployed on top of Kubernetes.
 See Istio's [Quick Start](https://istio.io/docs/setup/kubernetes/install/kubernetes/) page to get started.
 
+If you are using an earlier version of Istio (1.9+), you will have to customize the `AuthorizationPolicy` in the to use the
+`quick_start.yaml` file to use the `security.istio.io/v1beta1` API version instead of `security.istio.io/v1`.
+
 ## Steps
 
 ### 1. Install OPA-Envoy