Remove --command flag for service update

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

contrib/completion/bash/docker

@@ -1748,7 +1748,6 @@ _docker_service_update() {
 	if [ "$subcommand" = "update" ] ; then
 		options_with_args="$options_with_args
 			--arg
-			--command
 			--image
 		"
 

contrib/completion/zsh/_docker

@@ -1154,7 +1154,6 @@ __docker_service_subcommand() {
                 $opts_help \
                 $opts_create_update \
                 "($help)--arg=[Service command args]:arguments: _normal" \
-                "($help)--command=[Service command]:command: _command_names -e" \
                 "($help)--image=[Service image tag]:image:__docker_repositories" \
                 "($help -)1:service:__docker_complete_services" && ret=0
             ;;

docs/reference/commandline/service_update.md

@@ -18,7 +18,6 @@ Update a service
 
 Options:
       --arg value                    Service command args (default [])
-      --command value                Service command (default [])
       --constraint value             Placement constraints (default [])
       --endpoint-mode string         Endpoint mode (vip or dnsrr)
   -e, --env value                    Set environment variables (default [])