f - expand timer_tick_occurred docs

Author: jkczyz

lightning/src/ln/msgs.rs

@@ -1580,7 +1580,8 @@ pub trait OnionMessageHandler: EventsProvider {
 	/// drop and refuse to forward onion messages to this peer.
 	fn peer_disconnected(&self, their_node_id: &PublicKey);
 
-	/// Performs actions that should happen on startup and roughly every ten seconds thereafter.
+	/// Performs actions that should happen roughly every ten seconds after startup. Allows handlers
+	/// to drop any buffered onion messages intended for prospective peers.
 	fn timer_tick_occurred(&self);
 
 	// Handler information: