Update README.md

wrong description in old readme

Author: DiHo78

samples/features/t-sql-snapshot-backup/README.md

@@ -1,5 +1,5 @@
 # T-SQL Snapshot Backup
-This code sample demonstrates how to populate graph tables from an existing table or a csv files. It provides a couple of examples as well.
+This code sample demonstrates an end-to-end solution of backing up and restoring a database in an Azure SQL IaaS Virtual Machine using the T-SQL snapshot backup capabilities introduced in SQL Server 2022
 
 ### Contents