Merge branch 'mauro' into docs-mw

This series comes after:
    https://lore.kernel.org/linux-doc/cover.1773770483.git.mchehab+huawei@kernel.org/

It basically contains patches I submitted before on a 40+ patch series,
but were less relevant, plus a couple of other minor fixes:

- patch 1 improves one of the CTokenizer unit test, fixing some
  potential issues on it;
- patches 2 and 3 contain some improvement/fixes for Sphinx
  Python autodoc extension. They basically document c_lex.py;

- The remaining patches:
  - create a new class for kernel-doc config;
  - fix some internal representations of KdocItem;
  - add unit tests for KernelDoc() parser class;
  - add support to output KdocItem in YAML, which is a
    machine-readable output for all documented kAPI.

None of the patches should affect man or html output.

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