bpo-39693: mention KeyError in tarfile extractfile documentation (GH-18639) 

Co-authored-by: Andrey Darascheka <andrei.daraschenka@leverx.com>
(cherry picked from commit ec42789e6e14f6b6ac13569aeadc13798d7173a8)

Closes bpo-39693.
diff --git a/Misc/ACKS b/Misc/ACKS
index 2aa9a9d..021df26 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1941,5 +1941,6 @@
 Doug Zongker
 Peter Åstrand
 Vlad Emelianov
+Andrey Doroschenko
 
 (Entries should be added in rough alphabetical order by last names)