[3.10] bpo-45000: Update whatsnews about deleting __debug__ (GH-27956) (GH-27958)

(cherry picked from commit c764dfbcbc12c4653fc8ab39773cf973c9db2757)

Co-authored-by: Dong-hee Na <donghee.na@python.org>
diff --git a/Doc/whatsnew/3.10.rst b/Doc/whatsnew/3.10.rst
index d973448..129c0f7 100644
--- a/Doc/whatsnew/3.10.rst
+++ b/Doc/whatsnew/3.10.rst
@@ -883,6 +883,8 @@
   collisions when creating dictionaries and sets containing multiple NaNs.
   (Contributed by Raymond Hettinger in :issue:`43475`.)
 
+*  A :exc:`SyntaxError` (instead of a :exc:`NameError`) will be raised when deleting the :const:`__debug__` constant. (Contributed by Dong-hee Na in :issue:`45000`.)
+
 New Modules
 ===========