document TokenError and unclosed expression behavior (closes #12063)

Patch by Amandine Lee.
diff --git a/Misc/ACKS b/Misc/ACKS
index 344a29b..5f1a1dd 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -749,6 +749,7 @@
 Chris Lawrence
 Brian Leair
 Mathieu Leduc-Hamel
+Amandine Lee
 Antony Lee
 Christopher Lee
 Inyeol Lee