user-guide: fix authorization using k8s service account returning 403 instead of 200

KevFan · KevFan · commit c11802cffd1f · 2023-07-18T11:48:22.000+01:00
Closes: Kuadrant#216
diff --git a/doc/user-guides/authenticated-rl-with-jwt-and-k8s-authnz.md b/doc/user-guides/authenticated-rl-with-jwt-and-k8s-authnz.md
@@ -114,6 +114,10 @@ spec:
         kubernetes:
           audiences:
             - https://kubernetes.default.svc.cluster.local
+        extendedProperties:
+          - name: sub
+            valueFrom:
+              authJSON: auth.identity.user.username
     authorization:
       - name: k8s-rbac
         kubernetes:
