* doc/guix.texi (Desktop Services): Replace 'polkit-service' with 'polkit-service-type'. * gnu/services/dbus.scm (polkit-service): Deprecate procedure. * gnu/tests/docker.scm (%docker-os): Use polkit-service-type. * gnu/tests/virtualization.scm (%libvirt-os): Ditto. Signed-off-by: Ludovic Courtès <ludo@gnu.org>