bpo-41428: Documentation for PEP 604  (gh-22517)

diff --git a/Misc/ACKS b/Misc/ACKS
index 9be0e77..08449fe 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1257,6 +1257,7 @@
 Furkan Onder
 Koray Oner
 Ethan Onstott
+Ken Jin Ooi
 Piet van Oostrum
 Tomas Oppelstrup
 Jason Orendorff