Update spec

docs/spec/spec.md

@@ -258,6 +258,8 @@ In addition to the above parameters, it has `CursorOutParameter` to retrieve the
    stream<record{}, sql:Error?> resultStream = cursor.get();
    ```
 
+> **_Note:_** In the case of a stored procedure query that returns a result set along with the mentioned parameters, the `get()` method of these parameters should only be invoked after consuming the result set. Otherwise, consuming the result set fails with a 'Error when iterating the SQL result. The result set is closed.' error.
+
 ## 3.3. Query concatenation
 
 `sql:ParameterizedQuery` can be concatenated using util methods such as `sql:queryConcat()` and