message: Modals: updated ModalPageHeader desc, updated fullscreen modalpage ex.
diff: @@ -113,7 +113,7 @@ const App = withPlatform(withAdaptivity(class App extends React.Component {
  settlingHeight={100}
  header={
  <ModalPageHeader
  - right={platform === 'ios' && <PanelHeaderSubmit onClick={this.modalBack}/>}
  + right={platform === 'ios' && <PanelHeaderButton onClick={this.modalBack}><Icon24Dismiss/></PanelHeaderButton>}
  left={isMobile && platform === 'android' && <PanelHeaderClose onClick={this.modalBack}/>}
  >
  @{this.randomUser.screen_name}
  