vdf docs: remove mention of timestamped backup locations
vdf docs: remove mention of timestamped backup locations

The backups no longer reside in timestamped directories.

thockin/k8s.io,kubernetes/k8s.io,thockin/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,thockin/k8s.io,kubernetes/k8s.io,thockin/k8s.io