Fix old payment_point comment

Author: Antoine Riard

lightning/src/ln/chan_utils.rs

@@ -349,8 +349,8 @@ pub struct ChannelPublicKeys {
 	/// counterparty to create a secret which the counterparty can reveal to revoke previous
 	/// states.
 	pub revocation_basepoint: PublicKey,
-	/// The public key which receives our immediately spendable primary channel balance in
-	/// counterparty-broadcasted commitment transactions. This key is static across every commitment
+	/// The public key which receives an immediately spendable primary channel balance in
+	/// a counterparty's commitment transactions. 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