`<ListGroupItemHeading />` component example:

```js
import { 
  ListGroup, 
  ListGroupItem,
  ListGroupItemHeading,
} from '$PACKAGE_NAME';

<ListGroup>
  <ListGroupItemHeading>List group item heading</ListGroupItemHeading>
  <ListGroupItem>Cras justo odio</ListGroupItem>
</ListGroup>
```

`<ListGroupItemHeading />` component example wrapped inside `<ListGroupItem />`:

```js
import { 
  ListGroup, 
  ListGroupItem,
  ListGroupItemHeading,
} from '$PACKAGE_NAME';

<ListGroup>
  <ListGroupItem>
    <ListGroupItemHeading>List group item heading</ListGroupItemHeading>
  </ListGroupItem>
  <ListGroupItem>Cras justo odio</ListGroupItem>
</ListGroup>
```