Updated registry location for Fedora CoreOS OSTree Native Container

cross posted with this coreos@ list post

We have a container that can be used for deriving custom builds of Fedora CoreOS and previously we were hosting it in a temporary location at quay.io/coreos-assembler/fcos. We’ve now completed the migration to its final location at quay.io/fedora/fedora-coreos.

We have updated all of the examples in the CoreOS Layering Examples repo to use the new location. If you are using this container for any reason please update your references to use the new location. The old location will be removed after October 2022.