gh-105578: Document that AnyStr is deprecated in py313 (#107116)

It will not be removed until Python 3.18.

Doc/library/typing.rst

@@ -864,6 +864,16 @@ using ``[]``.
       def greet_proper(cond: bool) -> str | bytes:
           return "hi there!" if cond else b"greetings!"
 
+   .. deprecated-removed:: 3.13 3.18
+      Deprecated in favor of the new :ref:`type parameter syntax <type-params>`.
+      Use ``class A[T: (str, bytes)]: ...`` instead of importing ``AnyStr``. See
+      :pep:`695` for more details.
+
+      In Python 3.16, ``AnyStr`` will be removed from ``typing.__all__``, and
+      deprecation warnings will be emitted at runtime when it is accessed or
+      imported from ``typing``. ``AnyStr`` will be removed from ``typing``
+      in Python 3.18.
+
 .. data:: LiteralString
 
    Special type that includes only literal strings.
@@ -3700,3 +3710,7 @@ convenience. This is subject to change, and not all deprecations are listed.
      - 3.13
      - 3.15
      - :gh:`106309`
+   * - :data:`typing.AnyStr`
+     - 3.13
+     - 3.18
+     - :gh:`105578`

Doc/whatsnew/3.13.rst

@@ -196,6 +196,12 @@ Deprecated
     has yet to be supported by any major type checkers.
     (Contributed by Alex Waygood in :gh:`106309`.)
 
+  * :data:`typing.AnyStr` is deprecated. In Python 3.16, it will be removed from
+    ``typing.__all__``, and a :exc:`DeprecationWarning` will be emitted when it
+    is imported or accessed. It will be removed entirely in Python 3.18. Use
+    the new :ref:`type parameter syntax <type-params>` instead.
+    (Contributed by Michael The in :gh:`107116`.)
+
 * :mod:`wave`: Deprecate the ``getmark()``, ``setmark()`` and ``getmarkers()``
   methods of the :class:`wave.Wave_read` and :class:`wave.Wave_write` classes.
   They will be removed in Python 3.15.