Add PEP 688 special buffer methods to C API Type Object and Buffer Protocol docs

[cmaloney]

Documentation

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.

C API Type Object: https://docs.python.org/3/c-api/typeobj.html#tp-slots
Data Model: https://docs.python.org/3/reference/datamodel.html#emulating-buffer-types

Linked PRs

• gh-132246: Add special buffer methods to C API Type Object docs #132247
• gh-132246: Add PEP 688 to C Buffer Protocol docs #132249
• [3.13] gh-132246: Add PEP 688 to C Buffer Protocol docs (GH-132249) #132282
• [3.14] gh-132246: Add special buffer methods to C API Type Object docs (gh-132247) #134426
• [3.13] gh-132246: Add special buffer methods to C API Type Object docs (gh-132247) #134427

[cmaloney]

cc: @JelleZijlstra (PEP 688 Author)