update help for nextcloud xai occ cli command

add memory limit update to nextcloud

dockerfiles/services/nextcloud/cli/occ

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -ex
+set -e
 
 export DOCKER_HOST=${DOCKER_HOST:-'dkhost:2376'}
 
@@ -17,5 +17,6 @@ do
 done
 shift $((OPTIND -1))
 
+echo using container "${container}"
 # shellcheck disable=SC2068
 docker exec -it -u www-data "$container" php occ $@