This is just a page/repository under https://github.com/pure-data to discuss all things related to Pure Data's documentation, including help files, manual and also online resources such as puredata.info.
See https://github.com/pure-data/pddp/issues and https://github.com/pure-data/pddp/discussions/ or open issues/discussions yourself if you want to collaborate.
Documentation changes regarding contents of https://github.com/pure-data/pure-data (manual/help files) should be made via a PR to the documentation branch of that repository, which is curated by Alexandre Porres, see https://github.com/pure-data/pure-data/tree/documentation.