docs: Update kubernetes tutorial to refer to latest kube-mgmt release

The tutorial had not been updated to refer to the latest version which
has an important fixes to improve performance and consistency.

Signed-off-by: Torin Sandall <torinsandall@gmail.com>

docs/content/kubernetes-tutorial.md

@@ -211,7 +211,7 @@ spec:
             initialDelaySeconds: 3
             periodSeconds: 5
         - name: kube-mgmt
-          image: openpolicyagent/kube-mgmt:0.8
+          image: openpolicyagent/kube-mgmt:0.11
           args:
             - "--replicate-cluster=v1/namespaces"
             - "--replicate=extensions/v1beta1/ingresses"