f fix comment

Author: TheBlueMatt

lightning/src/ln/payment_tests.rs

@@ -2796,7 +2796,8 @@ fn do_no_missing_sent_on_midpoint_reload(persist_manager_with_payment: bool) {
 	// the double-claim that would otherwise appear at the end of this test.
 
 	// Ensure that, even after some time, if we restart we still include *something* in the current
-	// `ChannelManager` which prevents a `PaymentFailed` when we see the HTLC again on-chain later.
+	// `ChannelManager` which prevents a `PaymentFailed` when we restart even if pending resolved
+	// payments have since been timed out thanks to `IDEMPOTENCY_TIMEOUT_TICKS`.
 	// A naive implementation of the fix here would wipe the pending payments set, causing a
 	// failure event when we restart.
 	for _ in 0..(IDEMPOTENCY_TIMEOUT_TICKS * 2) { nodes[0].node.timer_tick_occurred(); }