Updated Docker (markdown)

Docker.md

@@ -132,7 +132,7 @@ With these commands you can do some cleanup of docker images and containers:
 sudo docker ps -a -f status=exited -q | xargs -r sudo docker rm
 
 # Remove leftover images
-sudo docker images --no-trunc -q -f dangling=true | xargs -r sudo docker rm
+sudo docker images --no-trunc -q -f dangling=true | xargs -r sudo docker rmi
 
 # Remove dangling volumes
 sudo docker volume ls -qf dangling=true | xargs -r sudo docker volume rm