fix(selection-helper-web): improve error message

Author: r0b1n

packages/pluggableWidgets/selection-helper-web/src/SelectionHelper.tsx

@@ -10,7 +10,8 @@ export function SelectionHelper(props: SelectionHelperContainerProps): ReactElem
     if (contextValue.hasError) {
         return (
             <Alert bootstrapStyle="danger">
-                The Selection helper widget must be placed inside the header of the Gallery widget with multi-selection.
+                The Selection Helper widget should be placed within the header section of the Data Grid 2 or the Gallery
+                widget with multi-selection enabled.
             </Alert>
         );
     }