f fix link

Author: TheBlueMatt

lightning/src/ln/channelmanager.rs

@@ -2775,6 +2775,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 	/// to [`abandon_payment`] to mark the payment as failed again). Otherwise, future calls to
 	/// [`retry_payment`] will fail with [`PaymentSendFailure::ParameterError`].
 	///
+	/// [`abandon_payment`]: Self::abandon_payment
 	/// [`retry_payment`]: Self::retry_payment
 	/// [`Event::PaymentFailed`]: events::Event::PaymentFailed
 	/// [`Event::PaymentSent`]: events::Event::PaymentSent