f Add missing doc link

Author: tnull

lightning/src/ln/outbound_payment.rs

@@ -594,6 +594,8 @@ pub enum Bolt11PaymentError {
 	/// [`ChannelManager::pay_for_bolt11_invoice`]: crate::ln::channelmanager::ChannelManager::pay_for_bolt11_invoice
 	InvalidAmount,
 	/// An invalid or incompatible invoice was provided to [`ChannelManager::pay_for_bolt11_invoice`].
+	///
+	/// [`ChannelManager::pay_for_bolt11_invoice`]: crate::ln::channelmanager::ChannelManager::pay_for_bolt11_invoice
 	InvalidInvoice,
 	/// The invoice was valid for the corresponding [`PaymentId`], but sending the payment failed.
 	SendingFailed(RetryableSendFailure),