Add missing VirtualService definition

Per https://istio.io/docs/examples/bookinfo/#determine-the-ingress-ip-and-port and https://raw.githubusercontent.com/istio/istio/release-1.3/samples/bookinfo/networking/bookinfo-gateway.yaml

content/rancher/v2.x/en/cluster-admin/tools/istio/setup/gateway/_index.md

@@ -53,6 +53,33 @@ spec:
         protocol: HTTP
       hosts:
         - "*"
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: VirtualService
+metadata:
+  name: bookinfo
+spec:
+  hosts:
+  - "*"
+  gateways:
+  - bookinfo-gateway
+  http:
+  - match:
+    - uri:
+        exact: /productpage
+    - uri:
+        prefix: /static
+    - uri:
+        exact: /login
+    - uri:
+        exact: /logout
+    - uri:
+        prefix: /api/v1/products
+    route:
+    - destination:
+        host: productpage
+        port:
+          number: 9080
 ```
 
 **Result:** You have configured your gateway resource so that Istio can receive traffic from outside the cluster.
@@ -100,4 +127,4 @@ In the gateway resource, the selector refers to Istio's default ingress controll
 1. Within `istio-system`, there is a workload named `istio-ingressgateway`.
 1. Click the name of this workload and go to the **Labels and Annotations** section. You should see that it has the key `istio` and the value `ingressgateway`. This confirms that the selector in the Gateway resource matches Istio's default ingress controller.
 
-### [Next: Set up Istio's Components for Traffic Management]({{<baseurl>}}/rancher/v2.x/en/cluster-admin/tools/istio/setup/set-up-traffic-management)
+### [Next: Set up Istio's Components for Traffic Management]({{<baseurl>}}/rancher/v2.x/en/cluster-admin/tools/istio/setup/set-up-traffic-management)