message: ListItem: selectable alpha -> beta
diff: </List>
  </Group>
  - <Group title="Selectable (Alpha)">
  + <Group title="Selectable (Beta)">
  <List>
  <ListItem selectable name="selectable-list" value="Feature 1">Feature 1</ListItem>
  <ListItem selectable name="selectable-list" value="Feature 2">Feature 2</ListItem>
  