reproduce:
        git checkout 03d44168cbd7fc57d5de56a3730427db758fc7f6
        b4 shazam https://lore.kernel.org/r/20240614-ls_fman-v1-1-cb33c96dc799@nxp.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs