Update sql-server-to-sql-database-overview.md

Added PaaS in front of Managed Instance Option

Author: sqlworldwide

articles/azure-sql/migration-guides/database/sql-server-to-sql-database-overview.md

@@ -20,7 +20,7 @@ You can migrate SQL Server databases running on-premises on:
 
 - SQL Server on Azure Virtual Machines.  
 - Azure SQL Database (PaaS).
-- Azure SQL Managed Instance.
+- Azure SQL Managed Instance (PaaS).
 - Amazon Web Services (AWS) Elastic Compute Cloud (EC2).
 - AWS Relational Database Service (RDS).
 - Compute Engine in Google Cloud Platform (GCP).