f grammarz and clarity

Author: TheBlueMatt

lightning/src/ln/channelmanager.rs

@@ -3606,11 +3606,12 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 
 	fn remove_stale_resolved_payments(&self) {
 		// If an outbound payment was completed, and no pending HTLCs remain, we should remove it
-		// from the map. However, if we did that immediately when the payment completes, this could
-		// race the user sending a duplicate payment (and relying on our idempotency guarantees on
-		// send_payment to avoid actually sending). Instead, we wait two timer ticks to do the
-		// actual removal. This should be more than sufficient to ensure and `send_payment` calls
-		// which were made at the same time the `PaymentSent` event was being processed complete.
+		// from the map. However, if we did that immediately when the last payment HTLC is claimed,
+		// this could race the user making a duplicate payment call (and relying on our idempotency
+		// guarantees on the PaymentId to avoid actually sending). Instead, we wait a few timer
+		// ticks to do the actual removal. This should be more than sufficient to ensure any
+		// `send_payment` calls that were made at the same time the `PaymentSent` event was being
+		// processed complete.
 		let mut pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
 		let pending_events = self.pending_events.lock().unwrap();
 		pending_outbound_payments.retain(|payment_id, payment| {