f! note new provide_channel_parameters requirements

Author: wpaulino

lightning/src/chain/keysinterface.rs

@@ -368,9 +368,11 @@ pub trait BaseSign {
 		-> Result<(Signature, Signature), ()>;
 
 	/// Set the counterparty static channel data, including basepoints,
-	/// counterparty_selected/holder_selected_contest_delay and funding outpoint.
-	/// This is done as soon as the funding outpoint is known.  Since these are static channel data,
-	/// they MUST NOT be allowed to change to different values once set.
+	/// counterparty_selected/holder_selected_contest_delay and funding outpoint. This is usually
+	/// done immediately upon signer derivation, unless the channel has yet to be funded, in which
+	/// case it is done as soon as the funding outpoint is known. Since these are static channel
+	/// data, they MUST NOT be allowed to change to different values once set. If the channel
+	/// parameters are already known, any further calls should act as a no-op.
 	///
 	/// channel_parameters.is_populated() MUST be true.
 	///