message: docs: added missed Group
diff: <View activePanel="spinner">
  <Panel id="spinner">
  <PanelHeader>Spinner</PanelHeader>
  + <Group>
  <div style={{ display: 'flex', alignItems: 'center', flexDirection: 'column' }}>
  <Spinner size="large" style={{ marginTop: 20 }} />
  <Spinner size="medium" style={{ marginTop: 20 }} />
  <Spinner size="regular" style={{ marginTop: 20 }} />
  <Spinner size="small" style={{ marginTop: 20 }} />
  </div>
  + </Group>
  </Panel>
  </View>
  ```
  