Issue #23406: Clarify documentation on multiplying a sequence

Patch from Matheus Vieira Portela.
diff --git a/Misc/ACKS b/Misc/ACKS
index 59d0914..5650f9b 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1084,6 +1084,7 @@
 Iustin Pop
 Claudiu Popa
 John Popplewell
+Matheus Vieira Portela
 Davin Potts
 Guillaume Pratte
 Florian Preinstorfer