[3.13] gh-141004: Document PyImport_Inittab (GH-141844) (GH-142016)

(cherry picked from commit 5f35702bb6)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

Doc/c-api/import.rst

@@ -325,3 +325,10 @@ Importing Modules
    If Python is initialized multiple times, :c:func:`PyImport_AppendInittab` or
    :c:func:`PyImport_ExtendInittab` must be called before each Python
    initialization.
+
+
+.. c:var:: struct _inittab *PyImport_Inittab
+
+   The table of built-in modules used by Python initialization. Do not use this directly;
+   use :c:func:`PyImport_AppendInittab` and :c:func:`PyImport_ExtendInittab`
+   instead.

Doc/extending/extending.rst

@@ -426,7 +426,7 @@ A pointer to the module definition must be returned via :c:func:`PyModuleDef_Ini
 so that the import machinery can create the module and store it in ``sys.modules``.
 
 When embedding Python, the :c:func:`!PyInit_spam` function is not called
-automatically unless there's an entry in the :c:data:`!PyImport_Inittab` table.
+automatically unless there's an entry in the :c:data:`PyImport_Inittab` table.
 To add the module to the initialization table, use :c:func:`PyImport_AppendInittab`,
 optionally followed by an import of the module::
 

Misc/NEWS.d/3.11.0a1.rst

@@ -4931,7 +4931,7 @@ Patch by Gabriele N. Tornetta
 .. nonce: 3p14JB
 .. section: C API
 
-:c:func:`Py_RunMain` now resets :c:data:`!PyImport_Inittab` to its initial
+:c:func:`Py_RunMain` now resets :c:data:`PyImport_Inittab` to its initial
 value at exit. It must be possible to call :c:func:`PyImport_AppendInittab`
 or :c:func:`PyImport_ExtendInittab` at each Python initialization. Patch by
 Victor Stinner.

Misc/NEWS.d/3.12.0a2.rst

@@ -35,11 +35,11 @@ Update bundled libexpat to 2.5.0
 .. nonce: ik4iOv
 .. section: Core and Builtins
 
-The docs clearly say that ``PyImport_Inittab``,
+The docs clearly say that :c:data:`PyImport_Inittab`,
 :c:func:`PyImport_AppendInittab`, and :c:func:`PyImport_ExtendInittab`
 should not be used after :c:func:`Py_Initialize` has been called. We now
 enforce this for the two functions.  Additionally, the runtime now uses an
-internal copy of ``PyImport_Inittab``, to guard against modification.
+internal copy of :c:data:`PyImport_Inittab`, to guard against modification.
 
 ..