[3.10] bpo-46120: State that | is preferred over Union (GH-30222) (GH-30250)

Co-authored-by: Éric <[email protected]>
Co-authored-by: Guido van Rossum <[email protected]>
(cherry picked from commit 1b30660)


Co-authored-by: Nikita Sobolev <[email protected]>

Automerge-Triggered-By: GH:gpshead

Author: miss-islington

Doc/library/typing.rst

@@ -625,7 +625,7 @@ These can be used as types in annotations using ``[]``, each having a unique syn
 
    Union type; ``Union[X, Y]`` is equivalent to ``X | Y`` and means either X or Y.
 
-   To define a union, use e.g. ``Union[int, str]`` or the shorthand ``int | str``.  Details:
+   To define a union, use e.g. ``Union[int, str]`` or the shorthand ``int | str``. Using that shorthand is recommended. Details:
 
    * The arguments must be types and there must be at least one.
 

Misc/NEWS.d/next/Documentation/2021-12-21-12-45-57.bpo-46120.PE0DmJ.rst

@@ -0,0 +1 @@
+State that ``|`` is preferred for readability over ``Union`` in the :mod:`typing` docs.