contrib/completion: remove --oom-score-adj daemon flag

This flag was deprecated in docker v24.0, and no longer functional
since v25.0; fully removed in v26.0, so we can remove the docs
for this.

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

contrib/completion/bash/docker

@@ -2591,7 +2591,6 @@ _docker_daemon() {
 		--mtu
 		--network-control-plane-mtu
 		--node-generic-resource
-		--oom-score-adjust
 		--pidfile -p
 		--registry-mirror
 		--seccomp-profile