Previous values did not prevent `sphinx-apidoc` to walk the content
of these directories (see [[ https://github.com/sphinx-doc/sphinx/blob/4.x/sphinx/ext/apidoc.py#L222-L223 | apidoc code ]]) resulting in really long processing when
directories contain a lof of entries (node_modules for instance).
That change enables to significantly speedup `swh-web` documentation build.