docs(eds-core-react): add DensityComparison story for Button

Author: eddiman

packages/eds-core-react/src/components/next/Button/Button.stories.tsx

@@ -346,6 +346,7 @@ export const DangerAction: Story = {
       <Button variant="primary" tone="danger">
         <Icon data={delete_forever} aria-hidden />
         Delete
+        <Icon data={delete_forever} aria-hidden />
       </Button>
       <Button variant="secondary" tone="danger">
         Cancel