Missing Row Layout in Example for NavigationRail

https://github.com/android/snippets/blob/24217733349a11ecfda799e6d60279812773f95f/compose/snippets/src/main/java/com/example/compose/snippets/components/Navigation.kt#L153-L180

This current example is not visible because it doesn't put the navigation rail in a row layout with it's navhost.

Open compose/snippets/src/main/java/com/example/compose/snippets/components/Navigation.kt at lines 153-180 and inspect the NavigationRail example. Confirm how the rail and NavHost are currently composed, then make the example visible by placing them in the required row layout. Done means the NavigationRail sample displays correctly with its NavHost.

Written by the indexing model from the issue text.