Fix the code example in dispatching::dialogue
//!
//! pub type Out = TransitionOut<D>;
//!
-//! pub async fn _1_transition(cx: TransitionIn, state: _1State) {
+//! pub async fn _1_transition(cx: TransitionIn, state: _1State) -> Out {
//! todo!()
//! }
-//! pub async fn _2_transition(cx: TransitionIn, state: _2State) {
+//! pub async fn _2_transition(cx: TransitionIn, state: _2State) -> Out {
//! todo!()
//! }
-//! pub async fn _3_transition(cx: TransitionIn, state: _3State) {
+//! pub async fn _3_transition(cx: TransitionIn, state: _3State) -> Out {
//! todo!()
//! }
//!
