bpo-36346: Document removal schedule of deprecate APIs (GH-20879)

We will remove wstr cache in Python 3.12. See PEP 623.
(cherry picked from commit 2d6f2ee)

Co-authored-by: Inada Naoki <[email protected]>

Author: miss-islington

Doc/c-api/arg.rst

@@ -151,7 +151,7 @@ which disallows mutable objects such as :class:`bytearray`.
       Previously, :exc:`TypeError` was raised when embedded null code points
       were encountered in the Python string.
 
-   .. deprecated-removed:: 3.3 4.0
+   .. deprecated-removed:: 3.3 3.12
       Part of the old-style :c:type:`Py_UNICODE` API; please migrate to using
       :c:func:`PyUnicode_AsWideCharString`.
 
@@ -160,23 +160,23 @@ which disallows mutable objects such as :class:`bytearray`.
    Unicode data buffer, the second one its length.  This variant allows
    null code points.
 
-   .. deprecated-removed:: 3.3 4.0
+   .. deprecated-removed:: 3.3 3.12
       Part of the old-style :c:type:`Py_UNICODE` API; please migrate to using
       :c:func:`PyUnicode_AsWideCharString`.
 
 ``Z`` (:class:`str` or ``None``) [const Py_UNICODE \*]
    Like ``u``, but the Python object may also be ``None``, in which case the
    :c:type:`Py_UNICODE` pointer is set to ``NULL``.
 
-   .. deprecated-removed:: 3.3 4.0
+   .. deprecated-removed:: 3.3 3.12
       Part of the old-style :c:type:`Py_UNICODE` API; please migrate to using
       :c:func:`PyUnicode_AsWideCharString`.
 
 ``Z#`` (:class:`str` or ``None``) [const Py_UNICODE \*, int or :c:type:`Py_ssize_t`]
    Like ``u#``, but the Python object may also be ``None``, in which case the
    :c:type:`Py_UNICODE` pointer is set to ``NULL``.
 
-   .. deprecated-removed:: 3.3 4.0
+   .. deprecated-removed:: 3.3 3.12
       Part of the old-style :c:type:`Py_UNICODE` API; please migrate to using
       :c:func:`PyUnicode_AsWideCharString`.
 

Doc/c-api/unicode.rst

@@ -19,8 +19,7 @@ points must be below 1114112 (which is the full Unicode range).
 
 :c:type:`Py_UNICODE*` and UTF-8 representations are created on demand and cached
 in the Unicode object.  The :c:type:`Py_UNICODE*` representation is deprecated
-and inefficient; it should be avoided in performance- or memory-sensitive
-situations.
+and inefficient.
 
 Due to the transition between the old APIs and the new APIs, Unicode objects
 can internally be in two states depending on how they were created:
@@ -434,7 +433,7 @@ APIs:
 
    If *u* is ``NULL``, this function behaves like :c:func:`PyUnicode_FromUnicode`
    with the buffer set to ``NULL``.  This usage is deprecated in favor of
-   :c:func:`PyUnicode_New`.
+   :c:func:`PyUnicode_New`, and will be removed in Python 3.12.
 
 
 .. c:function:: PyObject *PyUnicode_FromString(const char *u)
@@ -676,7 +675,7 @@ APIs:
 Deprecated Py_UNICODE APIs
 """"""""""""""""""""""""""
 
-.. deprecated-removed:: 3.3 4.0
+.. deprecated-removed:: 3.3 3.12
 
 These API functions are deprecated with the implementation of :pep:`393`.
 Extension modules can continue using them, as they will not be removed in Python

Misc/NEWS.d/next/Documentation/2020-06-15-10-45-45.bpo-36346.H0sS_i.rst

@@ -0,0 +1,2 @@
+Update some deprecated unicode APIs which are documented as "will be removed
+in 4.0" to "3.12". See :pep:`623` for detail.