docs: add note

Author: piaccho

examples/react-navigation-advanced/README.md

@@ -18,6 +18,8 @@ This example demonstrates an auth-gated React Navigation app with Detour integra
 - After sign-in, the rendered screen set changes. If onboarding has not been completed yet, `Onboarding` is shown — `Details` is still not rendered, so the pending link stays remembered.
 - After onboarding, `Details` becomes part of the rendered stack. React Navigation retries the unhandled action and navigates to `Details` (or falls through to `NotFound`).
 
+> **Note:** `UNSTABLE_routeNamesChangeBehavior="lastUnhandled"` is not deep-link-specific. It also captures other unhandled navigation actions — for example a manual `navigation.navigate(...)` call or an `initialState` pointing at a screen that isn't currently rendered — and replays them once that screen becomes part of the navigator. See the React Navigation docs for the full behavior.
+
 ### Expected dev-only warning
 
 When the link arrives while the target screen isn't rendered yet (e.g. on `SignIn`), React Navigation logs a development-only warning.