f docs tweak

lightning/src/chain/channelmonitor.rs

@@ -2012,7 +2012,7 @@ impl<Signer: Sign> ChannelMonitorImpl<Signer> {
 	}
 
 	/// Update state for new block(s)/transaction(s) confirmed. Note that the caller *must* update
-	/// self.best_block before calling, and set `conf_height` to the height at which any new
+	/// `self.best_block` before calling, and set `conf_height` to the height at which any new
 	/// transaction(s)/block(s) were confirmed at, even if it is not the current best height
 	/// (assuming we are being called with new transaction(s) confirmed).
 	fn block_confirmed<B: Deref, F: Deref, L: Deref>(