f typo in comment

Author: TheBlueMatt

lightning/src/ln/chanmon_update_fail_tests.rs

@@ -1645,7 +1645,7 @@ fn test_monitor_update_fail_claim() {
 
 	// Note that at this point there is a pending commitment transaction update for A being held by
 	// B. Even when we go to send the payment from C through B to A, B will not update this
-	// already-signed commitment transaction and will isntead wait for it to resolve before
+	// already-signed commitment transaction and will instead wait for it to resolve before
 	// forwarding the payment onwards.
 
 	let (_, payment_hash_2, payment_secret_2) = get_payment_preimage_hash!(nodes[0]);