This is a proposal to use Sphinx (instead of docbook) in order to generate the documentation for Tuleap.
nix-shell
make html
The documentation is generated in tuleap-documentation-fr/_build/html/fr/ You can check the modifications by opening index.html with your web browser. You need to build the documentation in order to see your modifications.
Tuleap and its documentation are licensed under GPLv2 or above.