f fix a few missing payment_base -> payment key things Jeff caught

Author: TheBlueMatt

lightning/src/chain/keysinterface.rs

@@ -601,7 +601,7 @@ impl KeysInterface for KeysManager {
 		}
 		let funding_key = key_step!(b"funding key", commitment_seed);
 		let revocation_base_key = key_step!(b"revocation base key", funding_key);
-		let payment_key = key_step!(b"payment base key", revocation_base_key);
+		let payment_key = key_step!(b"payment key", revocation_base_key);
 		let delayed_payment_base_key = key_step!(b"delayed payment base key", payment_key);
 		let htlc_base_key = key_step!(b"HTLC base key", delayed_payment_base_key);
 

lightning/src/ln/chan_utils.rs

@@ -277,8 +277,8 @@ pub struct ChannelPublicKeys {
 	/// a commitment transaction so that their counterparty can claim all available funds if they
 	/// broadcast an old state.
 	pub revocation_basepoint: PublicKey,
-	/// The base point which is used (with derive_public_key) to derive a per-commitment payment
-	/// public key which receives immediately-spendable non-HTLC-encumbered funds.
+	/// The public key which receives immediately-spendable non-HTLC-encumbered funds. This key is
+	/// static across every commitment transaction.
 	pub payment_point: PublicKey,
 	/// The base point which is used (with derive_public_key) to derive a per-commitment payment
 	/// public key which receives non-HTLC-encumbered funds which are only available for spending