Update README.md

Author: jodebrui

samples/databases/README.md

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 Contains samples databases for Microsoft's SQL databases include SQL Server, Azure SQL Database, and Azure SQL Data Warehouse.
 
-__[world-wide-importers](world-wide-importers/)__
+__[wide-world-importers](wide-world-importers/)__
 
 The new sample database for SQL Server 2016 and Azure SQL Database. It illustrates the core capabilities of SQL Server 2016 and Azure SQL Database, for transaction processing (OLTP), data warehousing and analytics (OLAP) workloads, as well as hybrid transaction and analytics processing (HTAP) workloads.