Add zsh completion for 'docker {run,create} --cpus'

Signed-off-by: Steve Durrheimer <s.durrheimer@gmail.com>

contrib/completion/zsh/_docker

@@ -524,6 +524,7 @@ __docker_container_subcommand() {
         "($help)*--cap-drop=[Drop Linux capabilities]:capability: "
         "($help)--cgroup-parent=[Parent cgroup for the container]:cgroup: "
         "($help)--cidfile=[Write the container ID to the file]:CID file:_files"
+        "($help)--cpus=[Number of CPUs (default 0.000)]:cpus: "
         "($help)*--device=[Add a host device to the container]:device:_files"
         "($help)*--device-read-bps=[Limit the read rate (bytes per second) from a device]:device:IO rate: "
         "($help)*--device-read-iops=[Limit the read rate (IO per second) from a device]:device:IO rate: "