Updated Unit of Work (markdown)

Unit-of-Work.md

@@ -39,7 +39,7 @@ Reference: [Use TransactionalAttribute + UnitOfWorkManager in ASP.NET Core to ac
 
 ```csharp
 // Scenario: An open Connection and Transaction already exist
-using (var conn = new Microsoft.Data.SqlClient.SqlConnection("..."))
+using (var conn = new SqlConnection("..."))
 {
     conn.Open();
     using (var tran = conn.BeginTransaction())