f drop outdated doc hunk

Author: TheBlueMatt

lightning/src/ln/channelmanager.rs

@@ -5309,11 +5309,6 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 	/// Check the holding cell in each channel and free any pending HTLCs in them if possible.
 	/// Returns whether there were any updates such as if pending HTLCs were freed or a monitor
 	/// update was applied.
-	///
-	/// This should only apply to HTLCs which were added to the holding cell because we were
-	/// waiting on a monitor update to finish. In that case, we don't want to free the holding cell
-	/// directly in `channel_monitor_updated` as it may introduce deadlocks calling back into user
-	/// code to inform them of a channel monitor update.
 	fn check_free_holding_cells(&self) -> bool {
 		let mut has_monitor_update = false;
 		let mut failed_htlcs = Vec::new();