updated comment to explain conditional derive macro

rust_crate/src/interface.rs

@@ -17,7 +17,7 @@ pub type SharedCell<T> = OnceLock<Mutex<RefCell<Option<T>>>>;
 /// Optionally, a custom binary called `binary` can also be included.
 /// This type is generic, and the message
 /// can be of any type declared in Protobuf.
-/// If the bevy feature is used, every message can be received as an event in bevy.
+/// If the bevy feature is used, every message can be received as an event in Bevy.
 #[cfg_attr(feature = "bevy", derive(Event))]
 pub struct DartSignal<T> {
     pub message: T,