You must be talking either about the connectstring attribute for tags or the connection string attribute in the datasource settings. The connectstring attribute for the tags cfquery, cfupdate, etc. was deprecated at version MX, hence long before Coldfusion 11. When you come across it in your code, you may delete it.
The issue reported as 'ConnectString attribute in ColdFusion MX 7 datasources does not work as expected' is related to the above, and was fixed many versions ago. As Carl says, you practically no longer need to enter a connection string in the datasource settings.
