f add note on the belt-and-suspenders force-write

Author: TheBlueMatt

lightning/src/ln/peer_handler.rs

@@ -1663,6 +1663,9 @@ where
 			Some(peer_mutex) => {
 				let mut peer = peer_mutex.lock().unwrap();
 				peer.awaiting_write_event = false;
+				// We go ahead and force at least one write here, because if we don't have any
+				// messages to send and the net driver thought we did that's weird, so they might
+				// also have a confused read-paused state that we should go ahead and clear.
 				self.do_attempt_write_data(descriptor, &mut peer, true);
 			},
 		};