Fix holder commitment variant comments

Author: alecchendev

lightning/src/ln/channel.rs

@@ -944,13 +944,12 @@ pub(crate) struct ShutdownResult {
 /// commitment points from our signer.
 #[derive(Debug, Copy, Clone)]
 enum HolderCommitmentPoint {
-	// TODO: add a variant for before our first commitment point is retrieved
 	/// We've advanced our commitment number and are waiting on the next commitment point.
-	/// Until the `get_per_commitment_point` signer method becomes async, this variant
-	/// will not be used.
+	///
+	/// We should retry advancing to `Available` via `try_resolve_pending` once our
+	/// signer is ready to provide the next commitment point.
 	PendingNext { transaction_number: u64, current: PublicKey },
-	/// Our current commitment point is ready, we've cached our next point,
-	/// and we are not pending a new one.
+	/// Our current commitment point is ready and we've cached our next point.
 	Available { transaction_number: u64, current: PublicKey, next: PublicKey },
 }