3.0.10: sphinx warnings reference target not found

[kloczek]

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.
Here is the output with warnings:

+ /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man
Running Sphinx v4.5.0
making output directory... done
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building [mo]: targets for 0 po files that are out of date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] 3 added, 0 changed, 0 removed
reading sources... [100%] index
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... flask-cors.1 { configuration api } /home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/docs/configuration.rst:55: WARNING: py:class reference target not found: re.Pattern
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: iterable
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: regex
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: regex
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: timedelta
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: integer
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/extension.py:docstring of flask_cors.extension.CORS:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: regex
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: string
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: regex
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: timedelta
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: integer
/home/tkloczko/rpmbuild/BUILD/flask-cors-3.0.10/flask_cors/decorator.py:docstring of flask_cors.decorator.cross_origin:: WARNING: py:class reference target not found: string
done
build succeeded, 21 warnings.

You can peak on fixes that kind of issues in other projects
latchset/jwcrypto#289
click-contrib/sphinx-click@abc31069
latchset/jwcrypto#289
RDFLib/rdflib-sqlalchemy#95