Now that the pre requisite work is complete, we can update https://github.com/openshift/enhancements/blob/master/enhancements/machine-config/manage-boot-images.md to reflect this and any changes in the mechanism itself.

Please refer to https://github.com/openshift/api/pull/2396 and https://github.com/openshift/cluster-control-plane-machine-set-operator/pull/368 for additional details the pre-req work that was completed.