Issue #24952: Clarify default argument of stack_size() in threading, _thread

Patch from Mattip.
diff --git a/Misc/ACKS b/Misc/ACKS
index 8ab9f77..9af7c98 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -888,6 +888,7 @@
 Simon Mathieu
 Laura Matson
 Graham Matthews
+mattip
 Martin Matusiak
 Dieter Maurer
 Daniel May
diff --git a/Misc/NEWS b/Misc/NEWS
index 0b46451..0204090 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -456,6 +456,9 @@
 Documentation
 -------------
 
+- Issue #24952: Clarify the default size argument of stack_size() in
+  the "threading" and "_thread" modules. Patch from Mattip.
+
 - Issue #24808: Update the types of some PyTypeObject fields. Patch by
   Joseph Weston.