Warnings when building the documentation

[Jayman2000]

Steps to reproduce

1. Make sure that your current working directory is a clone of this repository.

2. Create a virtual environment:

   python -m venv venv

3. Activate the virtual environment:

   source venv/bin/activate

4. (Optional) Update pip:

   python -m pip install --upgrade pip

5. Install the dependencies for building the docs:

   pip install . sphinx matplotlib

6. Switch to the doc: directory:

   cd doc

7. Build the docs:

   make html

Results

When I follow those instructions, I get two warnings:

pygame 2.5.2 (SDL 2.28.2, Python 3.12.0)
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 2.5.2 (SDL 2.28.2, Python 3.12.0)
Hello from the pygame community. https://www.pygame.org/contribute.html
sphinx-build -b html -d _build/doctrees   . _build/html
Running Sphinx v7.2.6
WARNING: Invalid configuration value found: 'language = None'. Update your configuration to a valid language code. Falling back to 'en' (English).
making output directory... done
building [mo]: targets for 0 po files that are out of date
writing output...
building [html]: targets for 17 source files that are out of date
updating environment: [new config] 17 added, 0 changed, 0 removed
reading sources... [100%] stickers
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
copying assets... copying static files... done
copying extra files... done
done
writing output... [100%] stickers
/hdd/home/jayman/VC/Git/Partially mine/pgzero/repo/doc/changelog.rst:10: WARNING: unknown document: 'repl'
generating indices... genindex done
writing additional pages... search done
copying images... [100%] _static/sticker-mockup.svg
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded, 2 warnings.

The HTML pages are in _build/html.

Build finished. The HTML pages are in _build/html.

System information

I’m running Python 3.12.0 on NixOS 23.11.