contrib/completion: remove --allow-nondistributable-artifacts flag

This flag is deprecated and no longer functional.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

contrib/completion/bash/docker

@@ -2551,7 +2551,6 @@ _docker_daemon() {
 	local options_with_args="
 		$global_options_with_args
 		--add-runtime
-		--allow-nondistributable-artifacts
 		--authorization-plugin
 		--bip
 		--bridge -b

contrib/completion/zsh/_docker

@@ -2726,7 +2726,6 @@ __docker_subcommand() {
             _arguments $(__docker_arguments) \
                 $opts_help \
                 "($help)*--add-runtime=[Register an additional OCI compatible runtime]:runtime:__docker_complete_runtimes" \
-                "($help)*--allow-nondistributable-artifacts=[Push nondistributable artifacts to specified registries]:registry: " \
                 "($help)*--authorization-plugin=[Authorization plugins to load]" \
                 "($help -b --bridge)"{-b=,--bridge=}"[Attach containers to a network bridge]:bridge:_net_interfaces" \
                 "($help)--bip=[Network bridge IP]:IP address: " \