Update README.md

Author: raheemadamboev

README.md

@@ -4,13 +4,13 @@ A simple app that demonstrates using NavigableListDetailPaneScaffold to adaptive
 
 [Download demo](https://github.com/raheemadamboev/navigable-list-detail-pane-scaffold-demo/blob/main/app-debug.apk)
 
-This is how composables displayed in phone screen:
+## Phone
 
 <p align="center">
   <img width="296" height="600" src="https://github.com/raheemadamboev/navigable-list-detail-pane-scaffold-demo/blob/main/banner_phone.gif" />
 </p>
 
-This is how composables displayed in table screen:
+## Tablet
 
 <p align="center">
   <img width="600" height="400" src="https://github.com/raheemadamboev/navigable-list-detail-pane-scaffold-demo/blob/main/banner_tablet.gif" />