DOC: fix a minor typo #159

	name: Build the documentation

	on:
	workflow_dispatch:

	pull_request:
	branches: [main]

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Checkout the branch
	uses: actions/checkout@v2.3.1
	with:
	persist-credentials: false

	- name: Set up Python 3.9
	uses: actions/setup-python@v1
	with:
	python-version: 3.9

	- name: Build the documentation with Sphinx
	run: \|
	pip install -e '.[dev]'
	sphinx-build -b html docs docs/build/html

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