Return the tabs demo to one example

docs/RUST.md

@@ -26,7 +26,7 @@ open work and measured constraints that are expensive to rediscover.
 The application crate has an rlib for tests and desktop and a cdylib for
 Android. Features select optional surfaces: `screens` links Iris, `fixture`
 embeds the synthetic transcript, and `bench` adds the benchmark runner. An
-ordinary APK uses `transcript-screen`, not `bench`.
+ordinary APK uses `screens`; only a benchmark build adds `bench`.
 
 ## Current state