Document restarts

[fhennig]

Users want to restart their services, we should document how it's done. I htink this can be documented at the top level for all services at once?

the thing to document could be as simple as

kubectl rollout restart statefulset --selector app.kubernetes.io/name=trino,app.kubernetes.io/instance=trino
kubectl rollout status statefulset --selector app.kubernetes.io/name=trino,app.kubernetes.io/instance=trino

To be refined.