1.5.6: sphinx 4.0.3 warnings

[kloczek]

+ /usr/bin/python3 setup.py build_sphinx -b man --build-dir build/sphinx
running build_sphinx
Running Sphinx v4.0.3
making output directory... done
building [mo]: targets for 0 po files that are out of date
building [man]: all manpages
updating environment: [new config] 8 added, 0 changed, 0 removed
reading sources... [100%] tutorial
/home/tkloczko/rpmbuild/BUILD/pyftpdlib-1.5.6/docs/tutorial.rst:355: WARNING: Inline literal start-string without end-string.
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... python-pyftpdlib.3 { install tutorial api faqs benchmarks rfc-compliance adoptions } /home/tkloczko/rpmbuild/BUILD/pyftpdlib-1.5.6/docs/api.rst:398: WARNING: undefined label: pre-fork-model
done
build succeeded, 2 warnings.

[kloczek]

Gentle ping .. 😄