VTY: clarify deprecation message for cfg_net_per_loc_upd_cmd

Change-Id: I95636a7713cd90956e46a5b6f8f7ded3bf4f5f0a
diff --git a/src/libmsc/msc_vty.c b/src/libmsc/msc_vty.c
index 6be09d8..4dd834b 100644
--- a/src/libmsc/msc_vty.c
+++ b/src/libmsc/msc_vty.c
@@ -297,8 +297,8 @@
 	int minutes = atoi(argv[0]);
 	int rc;
 
-	vty_out(vty, "%% 'periodic location update' is now deprecated: "
-		     "use 'timer T3212' to change subscriber expiration "
+	vty_out(vty, "%% 'periodic location update' is now deprecated. "
+		     "Use 'msc' / 'timer vlr T3212' to change subscriber expiration "
 		     "timeout.%s", VTY_NEWLINE);
 
 	/* We used to double this value and add a minute when scheduling the