update istiod gw sample in 1.8 upgrade notes (#8568)

Co-authored-by: Steven Landow <[email protected]>

Author: istio-testing

content/en/news/releases/1.8.x/announcing-1.8/upgrade-notes/index.md

@@ -56,7 +56,7 @@ For users with `values.global.meshExpansion.enabled=true`, perform the following
 1. Apply the code sample for exposing Istiod through ingress.
 
 {{< text bash >}}
-$ kubectl apply -f @samples/istiod-gateway/istiod-gateway.yaml@
+$ kubectl apply -f @samples/multicluster/expose-istiod.yaml@
 {{< /text >}}
 
    This removes `operator.istio.io/managed` labels from the associated Istio networking resources so that the Istio installer won't delete them. After this step, you can modify these resources freely.