Fix SQL stored procedure syntax by using SELECT instead of RETURN

[srdrtmy]

In SQL Server, RETURN is intended only for integer status codes so that SELECT is the correct for returning computed string results from a stored procedure

[Copilot]

Pull request overview

This PR corrects the SQL Server stored procedure example to return a computed string value via a result set, replacing the invalid use of RETURN (which is intended for integer status codes).

Changes:

• Updated the stored procedure example to use SELECT instead of RETURN for returning a concatenated string.

[Copilot]

The stored procedure now uses SELECT (good), but the example will return a single unnamed column and concatenates without a separator (e.g., SmithJohn). Consider adding a space between parts and giving the selected expression a column alias (e.g., AS FullName) so the result is clearer for readers and tools.

Suggested change

	SELECT @LastName + @FirstName;')");
	SELECT @LastName + N'' '' + @FirstName AS FullName;')");

[roji]

Thanks, makes sense.