[3.9] bpo-40204: Allow pre-Sphinx 3 syntax in the doc (GH-21844) (GH-21901)

* bpo-40204: Allow pre-Sphinx 3 syntax in the doc (GH-21844)

Enable Sphinx 3.2 "c_allow_pre_v3" option and disable the
c_warn_on_allowed_pre_v3 option to make the documentation compatible
with Sphinx 2 and Sphinx 3.

(cherry picked from commit 423e77d6de497931585d1883805a9e3fa4096b0b)

* bpo-40204: Fix Sphinx sytanx in howto/instrumentation.rst (GH-21858)

Use generic '.. object::' to declare markers, rather than abusing
'..  c:function::' which fails on Sphinx 3.

(cherry picked from commit 43577c01a2ab49122db696e9eaec6cb31d11cc81)

* bpo-40204: Fix duplicates in the documentation (GH-21857)

Fix two Sphinx 3 issues:

Doc/c-api/buffer.rst:304: WARNING: Duplicate C declaration, also defined in 'c-api/buffer'.
Declaration is 'PyBUF_ND'.

Doc/c-api/unicode.rst:1603: WARNING: Duplicate C declaration, also defined in 'c-api/unicode'.
Declaration is 'PyObject* PyUnicode_Translate(PyObject *str, PyObject *table, const char *errors)'.

(cherry picked from commit 46d10b1237c67ff8347f533eda6a5468d098f7eb)

* bpo-40204: Add :noindex: in the documentation (GH-21859)

Add :noindex: to duplicated documentation to fix "duplicate object
description" errors.

For example, fix this Sphinx 3 issue:

Doc/library/configparser.rst:1146: WARNING: duplicate object
description of configparser.ConfigParser.optionxform, other instance
in library/configparser, use :noindex: for one of them

(cherry picked from commit d3ded080482beae578faa704b13534a62d066f9f)

* bpo-40204, doc: Fix syntax of C variables (GH-21846)

For example, fix the following Sphinx 3 errors:

Doc/c-api/buffer.rst:102: WARNING: Error in declarator or parameters
Invalid C declaration: Expected identifier in nested name. [error at 5]
  void \*obj
  -----^

Doc/c-api/arg.rst:130: WARNING: Unparseable C cross-reference: 'PyObject*'
Invalid C declaration: Expected end of definition. [error at 8]
  PyObject*
  --------^

The modified documentation is compatible with Sphinx 2 and Sphinx 3.

(cherry picked from commit 474652fe9346382dbf793f20b671eb74668bebde)

* bpo-40204: Fix reference to terms in the doc (GH-21865)

Sphinx 3 requires to refer to terms with the exact case.

For example, fix the Sphinx 3 warning:

Doc/library/pkgutil.rst:71: WARNING: term Loader not found in case
sensitive match.made a reference to loader instead.

(cherry picked from commit bb0b08540cc93e56f3f1bde1b39ce086d9e35fe1)

* bpo-40204: Fix duplicated productionlist names in the doc (GH-21900)

Sphinx 3 disallows having more than one productionlist markup with
the same name. Simply remove names in this case, since names are not
shown anyway. For example, fix the Sphinx 3 warning:

Doc/reference/introduction.rst:96: duplicate token description
of *:name, other instance in reference/expressions

(cherry picked from commit 1abeda80f760134b4233608e2c288790f955b95a)

1 files changed, 4 insertions, 4 deletions

diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst
index b4540ac..1defee4 100644
--- a/Doc/whatsnew/3.5.rst
+++ b/Doc/whatsnew/3.5.rst
@@ -412,7 +412,7 @@ uses were to provide type hints to function parameters and return values.  It
 became evident that it would be beneficial for Python users, if the
 standard library included the base definitions and tools for type annotations.
 
-:pep:`484` introduces a :term:`provisional module <provisional api>` to
+:pep:`484` introduces a :term:`provisional module <provisional API>` to
 provide these standard definitions and tools, along with some conventions
 for situations where annotations are not available.
 
@@ -726,7 +726,7 @@ New Modules
 typing
 ------
 
-The new :mod:`typing` :term:`provisional <provisional api>` module
+The new :mod:`typing` :term:`provisional <provisional API>` module
 provides standard definitions and tools for function type annotations.
 See :ref:`Type Hints <whatsnew-pep-484>` for more information.
 
@@ -772,7 +772,7 @@ Steven Bethard, paul j3 and Daniel Eriksson in :issue:`14910`.)
 asyncio
 -------
 
-Since the :mod:`asyncio` module is :term:`provisional <provisional api>`,
+Since the :mod:`asyncio` module is :term:`provisional <provisional API>`,
 all changes introduced in Python 3.5 have also been backported to Python 3.4.x.
 
 Notable changes in the :mod:`asyncio` module since Python 3.4.0:
@@ -1867,7 +1867,7 @@ A new :func:`~sys.set_coroutine_wrapper` function allows setting a global
 hook that will be called whenever a :term:`coroutine object <coroutine>`
 is created by an :keyword:`async def` function.  A corresponding
 :func:`~sys.get_coroutine_wrapper` can be used to obtain a currently set
-wrapper.  Both functions are :term:`provisional <provisional api>`,
+wrapper.  Both functions are :term:`provisional <provisional API>`,
 and are intended for debugging purposes only.  (Contributed by Yury Selivanov
 in :issue:`24017`.)