Issue #16443: Add docstrings to regular expression match objects.

Patch by Anton Kasyanov.
diff --git a/Misc/ACKS b/Misc/ACKS
index ea7bea5..cfe7462 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -499,6 +499,7 @@
 Peter van Kampen
 Jacob Kaplan-Moss
 Piotr Kasprzyk
+Anton Kasyanov
 Lou Kates
 Hiroaki Kawai
 Sebastien Keim