[codex] Regenerate CUDA bindings docs references

[kkraus14]

What changed

• Regenerate cuda.bindings generated Cython and module docs from the cybind docs reference fixes.
• Convert generated CUDA Doxygen references to Sphinx :func:, :py:obj:, and :ref: roles when the corresponding Python API/object exists.
• Preserve C/device-only CUDA symbols such as cudaGraphKernelNodeUpdatesApply as literal text instead of linking them to an incorrect Python object.

Split

This is split out of #2159 so that #2159 stays focused on lychee/link checking.

The generator-side changes are in cybind MR !402:
https://gitlab-master.nvidia.com/leof/cybind/-/merge_requests/402

Validation

• UV_CACHE_DIR=/tmp/uv-cache uv run --group test pytest -p no:cacheprovider cybind/tests/test_legacy_cython_gen.py -q
• UV_CACHE_DIR=/tmp/uv-cache uv run ruff check --no-cache cybind/_doc_gen.py cybind/legacy_cython_gen/main.py cybind/tests/test_legacy_cython_gen.py
• PATH=/home/keith/git/cuda-python-private/.pixi/envs/cuda13/bin:$PATH UV_CACHE_DIR=/tmp/uv-cache uv run cybind --ctk-target-version 13.3.0 --generate driver runtime nvrtc --output-dir /tmp/cybind-cuda-python-regenerated21
• pixi run --manifest-path cuda_bindings -e docs build-docs

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[kkraus14]

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