Calling Stored Procedure example is wrong

The example of calling a stored procedure is incorrect.Thus the following :C:\sqlcmd 1> :Setvar FirstName Gustavo 1> :Setvar LastName Achong 1> EXEC dbo.ContactEmailAddress $(Gustavo),$(Achong) Should be:C:\sqlcmd 1> :Setvar FirstName Gustavo 1> :Setvar LastName Achong 1> EXEC dbo.ContactEmailAddress $(FirstName ),$(LastName)