f reword how we describe the payment id construciton

Author: TheBlueMatt

lightning/src/events/mod.rs

@@ -748,7 +748,7 @@ pub enum Event {
 		///
 		/// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
 		claim_deadline: Option<u32>,
-		/// A unique, random, ID describing this payment.
+		/// A unique ID describing this payment (derived from the list of HTLCs in the payment).
 		///
 		/// Payers may pay for the same [`PaymentHash`] multiple times (though this is unsafe and
 		/// an intermediary node may steal the funds). Thus, in order to accurately track when
@@ -803,7 +803,7 @@ pub enum Event {
 		///
 		/// Payments received on LDK versions prior to 0.0.124 will have this field unset.
 		onion_fields: Option<RecipientOnionFields>,
-		/// A unique, random, ID describing this payment.
+		/// A unique ID describing this payment (derived from the list of HTLCs in the payment).
 		///
 		/// Payers may pay for the same [`PaymentHash`] multiple times (though this is unsafe and
 		/// an intermediary node may steal the funds). Thus, in order to accurately track when