address review: add to whatsnew

Author: skirpichev

Doc/whatsnew/3.15.rst

@@ -144,6 +144,18 @@ typing
   (Contributed by Bénédikt Tran in :gh:`133823`.)
 
 
+Others
+------
+
+* Removed support for handling returned
+  non-:class:`float`/:class:`complex` types from
+  :meth:`~object.__float__` and :meth:`~object.__complex__`,
+  respectively.  This had previously raised a
+  :exc:`DeprecationWarning` since Python 3.7.
+  (Contributed by Sergey B Kirpichev in :gh:`109311`.)
+
+
+
 Porting to Python 3.15
 ======================