correct usage line

src/main/scripts/unix/download-shell-script-url-create

@@ -17,7 +17,7 @@ ATERM_URL=https://mediaflux.researchsoftware.unimelb.edu.au/mflux/aterm.jar
 usage() {
     echo ""
 	echo "Usage:"
-	echo "    $(basename $0) [-h|--help] [[--project <project ID>] --expire-days <number-of-days>] [--ncsr <ncsr>] [--overwrite] [--quiet] <namespace>"
+	echo "    $(basename $0) [-h|--help] [[--project <project ID>] --expire-days <number-of-days>] [--ncsr <ncsr>] [--overwrite] [--quiet] <id>"
 	echo ""
 	echo "Options:"
 	echo "    -h | --help                       prints usage."