0.9: sphinx 4.1.x warnings

+ /usr/bin/python3 setup.py build_sphinx -b man --build-dir build/sphinx
/usr/lib/python3.8/site-packages/setuptools/dist.py:697: UserWarning: Usage of dash-separated 'description-file' will not be supported in future versions. Please use the underscore name 'description_file' instead
  warnings.warn(
running build_sphinx
Running Sphinx v4.1.2
making output directory... done
WARNING: html_static_path entry '_static' does not exist
loading intersphinx inventory from http://docs.python.org/objects.inv...
intersphinx inventory has moved: http://docs.python.org/objects.inv -> https://docs.python.org/3/objects.inv
building [mo]: targets for 0 po files that are out of date
building [man]: all manpages
updating environment: [new config] 6 added, 0 changed, 0 removed
reading sources... [100%] tutorial
/home/tkloczko/rpmbuild/BUILD/python-libevdev-0.9/libevdev/event.py:docstring of libevdev.event.InputEvent.code:1: WARNING: duplicate object description of libevdev.event.InputEvent.code, other instance in libevdev, use :noindex: for one of them
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... python-libevdev.3 { tutorial modules libevdev examples python-evdev } done
build succeeded, 2 warnings.