add whatsnew entry

Author: iritkatriel

Doc/whatsnew/3.14.rst

@@ -108,10 +108,8 @@ ast
   (Contributed by Batuhan Taskaya and Jeremy Hylton in :issue:`15987`.)
 
 * Add support for :func:`copy.replace` for AST nodes.
-
   (Contributed by Bénédikt Tran in :gh:`121141`.)
 
-
 ctypes
 ------
 
@@ -401,6 +399,10 @@ typing
 * Remove :class:`!typing.ByteString`. It had previously raised a
   :exc:`DeprecationWarning` since Python 3.12.
 
+* The ``.generic_base`` base class of generic classes is now added by
+  the parser rather than the compiler. This means that it is visible in
+  the ``AST``. (Contributed by Irit Katriel in :gh:`123881`.)
+
 urllib
 ------