f rephase for clarity

Author: TheBlueMatt

lightning/src/util/events.rs

@@ -358,7 +358,8 @@ pub enum Event {
 	/// something. You may wish to retry with a different route.
 	///
 	/// If you have given up retrying this payment and wish to fail it, you MUST call
-	/// [`ChannelManager::abandon_payment`] or memory related to payment tracking will leak.
+	/// [`ChannelManager::abandon_payment`] at least once for a given [`PaymentId`] or memory
+	/// related to payment tracking will leak.
 	///
 	/// Note that this does *not* indicate that all paths for an MPP payment have failed, see
 	/// [`Event::PaymentFailed`] and [`all_paths_failed`].