[3.12] gh-107298: Fix numerous ref errors and typos in the C API docs (GH-108258) (#108284)

gh-107298: Fix numerous ref errors and typos in the C API docs (GH-108258)
(cherry picked from commit d7202e4879)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Doc/c-api/exceptions.rst

@@ -222,17 +222,21 @@ For convenience, some of these functions will always return a
 
 .. c:function:: PyObject* PyErr_SetFromWindowsErrWithFilename(int ierr, const char *filename)
 
-   Similar to :c:func:`PyErr_SetFromWindowsErrWithFilenameObject`, but the
-   filename is given as a C string.  *filename* is decoded from the filesystem
-   encoding (:func:`os.fsdecode`).
+   Similar to :c:func:`PyErr_SetFromWindowsErr`, with the additional behavior
+   that if *filename* is not ``NULL``, it is decoded from the filesystem
+   encoding (:func:`os.fsdecode`) and passed to the constructor of
+   :exc:`OSError` as a third parameter to be used to define the
+   :attr:`!filename` attribute of the exception instance.
 
    .. availability:: Windows.
 
 
 .. c:function:: PyObject* PyErr_SetExcFromWindowsErrWithFilenameObject(PyObject *type, int ierr, PyObject *filename)
 
-   Similar to :c:func:`PyErr_SetFromWindowsErrWithFilenameObject`, with an
-   additional parameter specifying the exception type to be raised.
+   Similar to :c:func:`PyErr_SetExcFromWindowsErr`, with the additional behavior
+   that if *filename* is not ``NULL``, it is passed to the constructor of
+   :exc:`OSError` as a third parameter to be used to define the
+   :attr:`!filename` attribute of the exception instance.
 
    .. availability:: Windows.
 

Doc/c-api/init_config.rst

@@ -82,6 +82,8 @@ PyWideStringList
    If *length* is non-zero, *items* must be non-``NULL`` and all strings must be
    non-``NULL``.
 
+   .. c:namespace:: NULL
+
    Methods:
 
    .. c:function:: PyStatus PyWideStringList_Append(PyWideStringList *list, const wchar_t *item)
@@ -101,6 +103,8 @@ PyWideStringList
 
       Python must be preinitialized to call this function.
 
+   .. c:namespace:: PyWideStringList
+
    Structure fields:
 
    .. c:member:: Py_ssize_t length

Doc/c-api/module.rst

@@ -338,6 +338,7 @@ The available slot types are:
    The *value* pointer of this slot must point to a function of the signature:
 
    .. c:function:: PyObject* create_module(PyObject *spec, PyModuleDef *def)
+      :noindex:
 
    The function receives a :py:class:`~importlib.machinery.ModuleSpec`
    instance, as defined in :PEP:`451`, and the module definition.
@@ -372,6 +373,7 @@ The available slot types are:
    The signature of the function is:
 
    .. c:function:: int exec_module(PyObject* module)
+      :noindex:
 
    If multiple ``Py_mod_exec`` slots are specified, they are processed in the
    order they appear in the *m_slots* array.
@@ -380,6 +382,8 @@ The available slot types are:
 
    Specifies one of the following values:
 
+   .. c:namespace:: NULL
+
    .. c:macro:: Py_MOD_MULTIPLE_INTERPRETERS_NOT_SUPPORTED
 
       The module does not support being imported in subinterpreters.

Doc/c-api/unicode.rst

@@ -1299,7 +1299,7 @@ the user settings on the machine running the codec.
 
    Encode the Unicode object using the specified code page and return a Python
    bytes object.  Return ``NULL`` if an exception was raised by the codec. Use
-   :c:macro:`CP_ACP` code page to get the MBCS encoder.
+   :c:macro:`!CP_ACP` code page to get the MBCS encoder.
 
    .. versionadded:: 3.3