Fix typo simple_reference docstring, fix workflows to use python 3.11 by default #928

	---
	name: Tutorial tests

	on:
	push:
	branches: [master]
	pull_request:
	branches: [master]

	permissions:
	contents: read

	jobs:
	tutorial-test:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ['3.8', '3.9', '3.10', '3.11']
	tutorial: [Tianshou, CustomEnvironment, CleanRL, SB3/kaz, SB3/waterworld, SB3/connect_four, SB3/test] # TODO: add back AgileRL once issue is fixed on their end
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies and run tutorials
	run: \|
	sudo apt-get install python3-opengl xvfb parallel
	export PATH=/path/to/parallel:$PATH
	export root_dir=$(pwd)
	cd tutorials/${{ matrix.tutorial }}
	pip install -r requirements.txt
	pip uninstall -y pettingzoo
	pip install -e $root_dir[testing]
	AutoROM -v
	for f in *.py; do xvfb-run -a -s "-screen 0 1024x768x24" python "$f"; done

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