[3.12] Mention Ellipsis pickling in the docs (GH-103660) (#108661)

Mention Ellipsis pickling in the docs (GH-103660)
(cherry picked from commit 14ec0bb7c363def917f768b76f334146a3cddd84)

Co-authored-by: sterliakov <50529348+sterliakov@users.noreply.github.com>

diff --git a/Doc/library/pickle.rst b/Doc/library/pickle.rst
index 79476b04cd914da77e22d1f9763dde4d6bee38c8..d6be4ba33fa80b21a9f324d0764738a815696d6d 100644 (file)
--- a/Doc/library/pickle.rst
+++ b/Doc/library/pickle.rst
@@ -494,7 +494,8 @@ What can be pickled and unpickled?
 
 The following types can be pickled:
 
-* ``None``, ``True``, and ``False``;
+* built-in constants (``None``, ``True``, ``False``, ``Ellipsis``, and
+  ``NotImplemented``);
 
 * integers, floating-point numbers, complex numbers;