Eliminate (possibly through upstream reformulating or ifdefs) mentions of Docker and DockerHub from the Prerequisites section at https://access.redhat.com/documentation/en-us/red_hat_codeready_workspaces/2.5/html/administration_guide/customizing-the-registries_crw#running-custom-registries_crw

CRW docs shoyuld use only Podman and Quay.io.