Fix warnings when building docs

[wookie184]

Previously got these warnings from a fresh docs build

(venv) PS D:\pinnwand\doc> sphinx-build . _build -E
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building [mo]: targets for 0 po files that are out of date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building [html]: targets for 7 source files that are out of date
updating environment: [new config] 7 added, 0 changed, 0 removed
reading sources... [100%] usage
../CHANGELOG.rst:137: WARNING: Inline emphasis start-string without end-string.
looking for now-outdated files...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%] usage
generating indices... genindex py-modindex done
writing additional pages... search done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded, 2 warnings.

[supakeen]

Thanks!