DOCSP 34588 Update RM supported databases topic to cover SQL Server 2012 (#75)

* DOCSP-34588 updating supported databases

* DOCSP-34588 updating supported databases

* DOCSP-34588 tech edits

* DOCSP-34588 tech edits

* DOCSP-34588 tech edits

* empty

Author: ltran-mdb2

source/supported-databases.txt

@@ -43,7 +43,8 @@ Relational Migrator supports the following source databases:
      - Self hosted, AWS RDS
 
    * - Microsoft SQL Server
-     - 2017 and higher
+     - 2012 and higher (Enterprise or Developer edition required for
+       versions before 2016)
      - Self hosted, AWS RDS, Azure SQL Database
 
    * - PostgreSQL