updated WWI toc

Author: craigg-msft

docs/sample/world-wide-importers/TOC.md

@@ -1,16 +1,17 @@
 # [Overview](overview.md)
 # [Wide World Importers Documentation](wide-world-importers-documentation.md)
-# [Data generation.md](data-generation.md)
-# [ETL workflow.md](etl-workflow.md)
+
+# [Wide World Importers OLTP Database](wide-world-importers-oltp-database.md)
+## [Database catalog - OLTP](database-catalog-oltp.md)
+## [Installation and configuration - WWI- OLTP](installation-and-configuration-wwi-oltp.md)
+## [Sample queries - OLTP](sample-queries-oltp.md)
+## [Use of SQL Server features - OLTP](use-of-sql-server-features-and-capabilities-wwi-oltp.md)
 
 # [Wide World Importers - OLAP Database](wide-world-importers-olap-database.md)
 ## [Sample queries WWI - OLAP](sample-queries-wwi-olap.md)
 ## [Database catalog WWI - OLAP](database-catalog-wwi-olap.md)
 ## [Use of SQL Server features - OLAP](use-of-sql-server-features-and-capabilities-olap.md)
 ## [installation-and-configuration - OLAP](installation-and-configuration-olap.md)
 
-# [Wide World Importers OLTP Database](wide-world-importers-oltp-database.md)
-## [Database catalog - OLTP](database-catalog-oltp.md)
-## [Installation and configuration - WWI- OLTP](installation-and-configuration-wwi-oltp.md)
-## [Sample queries - OLTP](sample-queries-oltp.md)
-## [Use of SQL Server features - OLTP](use-of-sql-server-features-and-capabilities-wwi-oltp.md)
+# [Data generation](data-generation.md)
+# [ETL workflow](etl-workflow.md)