message: concept.md: more informative examples
diff: @@ -31,14 +31,23 @@ import { View, Panel } from '@vkontakte/vkui';
  import { Root, View } from '@vkontakte/vkui';
  <Root activeView="main">
  - <View id="main">
  - {* main flow *}
  + <View id="main" activePanel="general">
  + <Panel id="general">
  + {* general *}
  + </Panel>
  + <Panel id="education">
  + {* education *}
  + </Panel>
  </View>
  - <View id="users-search">
  + <View id="users-search" activePanel="users-search">
  + <Panel id="users-search">
  {* modal window for users search *}
  + </Panel>
  </View>
  - <View id="check-user-actions">
  + <View id="check-user-actions" activePanel="check-user-actions">
  + <Panel id="check-user-actions">
  {* modal window for check user actions *}
  + </Panel>
  </View>
  </Root>
  ```
  