Update Event::PaymentReceived docs since we require payment secret

Users no longer need to verify the amounts of received payments as
the payment secret will protect us against the probing attacks such
verification was intended to fix.

Author: TheBlueMatt

lightning/src/util/events.rs

@@ -92,15 +92,16 @@ pub enum Event {
 		user_channel_id: u64,
 	},
 	/// Indicates we've received money! Just gotta dig out that payment preimage and feed it to
-	/// ChannelManager::claim_funds to get it....
-	/// Note that if the preimage is not known or the amount paid is incorrect, you should call
-	/// ChannelManager::fail_htlc_backwards to free up resources for this HTLC and avoid
+	/// [`ChannelManager::claim_funds`] to get it....
+	/// Note that if the preimage is not known, you should call
+	/// [`ChannelManager::fail_htlc_backwards`] to free up resources for this HTLC and avoid
 	/// network congestion.
-	/// The amount paid should be considered 'incorrect' when it is less than or more than twice
-	/// the amount expected.
-	/// If you fail to call either ChannelManager::claim_funds or
-	/// ChannelManager::fail_htlc_backwards within the HTLC's timeout, the HTLC will be
+	/// If you fail to call either [`ChannelManager::claim_funds`] or
+	/// [`ChannelManager::fail_htlc_backwards`] within the HTLC's timeout, the HTLC will be
 	/// automatically failed.
+	///
+	/// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
+	/// [`ChannelManager::fail_htlc_backwards`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards
 	PaymentReceived {
 		/// The hash for which the preimage should be handed to the ChannelManager.
 		payment_hash: PaymentHash,