reproduce:
        git checkout 1f5ffc672165ff851063a5fd044b727ab2517ae3
        b4 shazam https://lore.kernel.org/r/20260422-v7-0-0-net-next-driver-removal-v1-v2-15-08a5b59784d5@lunn.ch
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs