f clarify test change comment

Author: TheBlueMatt

lightning/src/ln/functional_tests.rs

@@ -9222,8 +9222,10 @@ fn test_duplicate_chan_id() {
 
 	let funding_created = {
 		let mut a_channel_lock = nodes[0].node.channel_state.lock().unwrap();
-		// Note that we drop the channel entirely here as its in a somewhat nonsense state (leaving
-		// the channelmanager in a possibly nonsense state instead).
+		// Once we call `get_outbound_funding_created` the channel has a duplicate channel_id as
+		// another channel in the ChannelManager - an invalid state. Thus, we'd panic later when we
+		// try to create another channel. Instead, we drop the channel entirely here (leaving the
+		// channelmanager in a possibly nonsense state instead).
 		let mut as_chan = a_channel_lock.by_id.remove(&open_chan_2_msg.temporary_channel_id).unwrap();
 		let logger = test_utils::TestLogger::new();
 		as_chan.get_outbound_funding_created(tx.clone(), funding_outpoint, &&logger).unwrap()