Ensure hotpatch documentation is up to date about how to hot patch Kubernetes
Taken from a comment by @amyphillips
@ggillies we actually had to hotpatch production the other week to fix production#5340 (closed) (we did the staging patch for K8s, and the production patch for VMs) so we know things work. We should review the hotpatch tool & documentation to make sure it's really clear what needs to be done to patch on K8s without needing Jarv on the call.