f mention rbf updates

Author: TheBlueMatt

lightning/src/util/config.rs

@@ -29,7 +29,8 @@ pub struct ChannelHandshakeConfig {
 	///
 	/// This is one of the main parameters of our security model. We (or one of our watchtowers) MUST
 	/// be online to check for revoked transactions on-chain at least once every our_to_self_delay
-	/// blocks (plus some margin to allow us enough time to broadcast and confirm a transaction).
+	/// blocks (plus some margin to allow us enough time to broadcast and confirm a transaction,
+	/// possibly with time in between to RBF the spending transaction).
 	///
 	/// Meanwhile, asking for a too high delay, we bother peer to freeze funds for nothing in
 	/// case of an honest unilateral channel close, which implicitly decrease the economic value of