Documentation/bootkube.md: make scp kubeconfig command copy-pastable
Documentation/bootkube.md: make scp kubeconfig command copy-pastable

In the bootkube documentation make the command to copy kubeconfig
files to all nodes copy-pastable by adding a for loop.

enilfodne/matchbox,dghubble/matchbox,coreos/coreos-baremetal,dghubble/matchbox,enilfodne/matchbox,coreos/coreos-baremetal