gh-112092: clarify unstable ABI recompilation requirements (GH-112093)
Use different versions in the examples for when extensions do and do not need to be recompiled to make the examples easier to understand.
(cherry picked from commit 68a7b78cd5)
Co-authored-by: DerSchinken <53398996+DerSchinken@users.noreply.github.com>
- Reformat the C API and ABI Versioning page (and extend/clarify a bit)
- Rewrite the stable ABI docs into a general text on C API Compatibility
- Add a list of Limited API contents, and notes for the individual items.
- Replace `Include/README.rst` with a link to a devguide page with the same info