Update bulk-loading-northwind-csv.sql

Author: openlink

bulk-loading-northwind-csv.sql

@@ -1,5 +1,5 @@
 -- Create Filesystem Mapping Files to control Virtuoso Table Name preferences via the following files
--- in ~virtuoso/vad directory 
+-- in ~virtuoso/vad directory, downloaded and extracted from: http://bitnine.net/tutorial/import-northwind-dataset.zip
 
 -- "csv_bl"."Northwind"."territories > territories.tb
 -- "csv_bl"."Northwind"."suppliers" > suppliers.tb