fixed toc

Author: MashaMSFT

docs/samples/TOC.md

@@ -4,17 +4,16 @@
 
 # Wide World Importers
 ## [Overview](wide-world-importers-what-is.md)
-## Install and Configure
 ## OLTP
 ### [Database catalog](wide-world-importers-oltp-database-catalog.md)
 ### [Install and configure](wide-world-importers-oltp-install-configure.md)
 ### [SQL Server features](wide-world-importers-oltp-use-of-sql-server-features.md)
 ## Data Warehouse
-## [Database catalog](wide-world-importers-dw-database-catalog.md)
-## [Install and configure](wide-world-importers-dw-install-configure.md)
-## [SQL Server features](wide-world-importers-dw-use-of-sql-server-features.md)
-## [Generate data](wide-world-importers-generate-data.md)
-## [ETL workflow](wide-world-importers-perform-etl.md)
+### [Database catalog](wide-world-importers-dw-database-catalog.md)
+### [Install and configure](wide-world-importers-dw-install-configure.md)
+### [SQL Server features](wide-world-importers-dw-use-of-sql-server-features.md)
+### [Generate data](wide-world-importers-generate-data.md)
+### [ETL workflow](wide-world-importers-perform-etl.md)
 
 ## [New and updated articles](new-updated-samples.md) 
 # [Code Samples on GitHub](https://github.com/Microsoft/sql-server-samples/tree/master/samples)