mgcp_client_vty: cosmetic: doc string should terminated with \n

Change-Id: I34c16490e08af0c9853f1a794113c191bb65d09a
diff --git a/src/libosmo-mgcp-client/mgcp_client_vty.c b/src/libosmo-mgcp-client/mgcp_client_vty.c
index 7779e2c..34502af 100644
--- a/src/libosmo-mgcp-client/mgcp_client_vty.c
+++ b/src/libosmo-mgcp-client/mgcp_client_vty.c
@@ -351,7 +351,7 @@
 }
 
 DEFUN_ATTR(cfg_mgw,
-	   cfg_mgw_cmd, "mgw <0-255>", "Select a MGCP client config to setup\n" "reference number", CMD_ATTR_IMMEDIATE)
+	   cfg_mgw_cmd, "mgw <0-255>", "Select a MGCP client config to setup\n" "reference number\n", CMD_ATTR_IMMEDIATE)
 {
 	int nr = atoi(argv[0]);
 	struct mgcp_client_pool_member *pool_member;