[3.12] Docs: Resolve Sphinx warnings in dis.rst (GH-108476) (#108546)

Docs: Resolve Sphinx warnings in dis.rst (GH-108476)

- Link to the code objects reference
- Suppress link to deliberately undocumented builtins.__build_class__
- Suppress links for example methods
(cherry picked from commit cb1184280b3fb369a07abb4153aa36829cf1df9b)

Co-authored-by: Erlend E. Aasland <erlend@python.org>