pythongh-132246: Add special buffer methods to C API Type Object docs

Two special methods, __buffer__ and __release_buffer__ were added to
Python 3.12 by PEP 688. The C API Type Object documentation for slots
includes `tp_as_buffer`, and sub-slots `bf_getbuffer`, `bf_releasebuffer`
but does not refer to the Python Data Model version of those. Add the
missing references.

Author: cmaloney

Doc/c-api/typeobj.rst

@@ -79,7 +79,7 @@ Quick Reference
    | :c:member:`~PyTypeObject.tp_setattro`          | :c:type:`setattrofunc`            | __setattr__,      | X | X |   | G |
    |                                                |                                   | __delattr__       |   |   |   |   |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
-   | :c:member:`~PyTypeObject.tp_as_buffer`         | :c:type:`PyBufferProcs` *         |                   |   |   |   | % |
+   | :c:member:`~PyTypeObject.tp_as_buffer`         | :c:type:`PyBufferProcs` *         | :ref:`sub-slots`  |   |   |   | % |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
    | :c:member:`~PyTypeObject.tp_flags`             | unsigned long                     |                   | X | X |   | ? |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
@@ -325,9 +325,16 @@ sub-slots
    +---------------------------------------------------------+-----------------------------------+---------------+
    |                                                                                                             |
    +---------------------------------------------------------+-----------------------------------+---------------+
-   | :c:member:`~PyBufferProcs.bf_getbuffer`                 | :c:func:`getbufferproc`           |               |
+   | :c:member:`~PyBufferProcs.bf_getbuffer`                 | :c:func:`getbufferproc`           | :meth:`\      |
+   |                                                         |                                   | object.\      |
+   |                                                         |                                   | __buffer__`   |
+   |                                                         |                                   |               |
+   |                                                         |                                   |               |
    +---------------------------------------------------------+-----------------------------------+---------------+
-   | :c:member:`~PyBufferProcs.bf_releasebuffer`             | :c:func:`releasebufferproc`       |               |
+   | :c:member:`~PyBufferProcs.bf_releasebuffer`             | :c:func:`releasebufferproc`       | :meth:`\      |
+   |                                                         |                                   | object.\      |
+   |                                                         |                                   | __release_\   |
+   |                                                         |                                   | buffer__`     |
    +---------------------------------------------------------+-----------------------------------+---------------+
 
 .. _slot-typedefs-table: