doc: fix typo #1156

	name: Mutation tests
	on:
	push:
	branches:
	- master
	pull_request:
	jobs:
	mutation:
	name: Mutation tests
	runs-on: ubuntu-latest
	env:
	php-version: '8.1'
	php-extensions: ds,yaml
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	with:
	fetch-depth: 0 # Needed for the `git diff` used below for Infection

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ env.php-version }}
	extensions: ${{ env.php-extensions }}
	ini-values: zend.assertions=1
	coverage: pcov

	- uses: "ramsey/composer-install@v2"

	- name: Creating var directory
	run: mkdir -p var/cache

	- name: Cache Mutation results
	uses: actions/[email protected]
	with:
	path: var/cache
	key: mutation-${{ hashFiles('composer.lock') }}-${{ hashFiles('.github/workflows/mutation.yml') }}
	restore-keys: mutation-${{ hashFiles('composer.lock') }}-${{ hashFiles('.github/workflows/mutation.yml') }}

	- name: Running mutation tests
	if: github.ref == 'refs/heads/master'
	run: php vendor/bin/infection --threads=$(nproc)
	env:
	INFECTION_BADGE_API_KEY: ${{ secrets.INFECTION_BADGE_API_KEY }}

	- name: Running mutation tests
	if: github.event_name == 'pull_request'
	run: \|
	git fetch --depth=1 origin $GITHUB_BASE_REF
	php vendor/bin/infection --threads=$(nproc) --git-diff-lines --git-diff-base=origin/$GITHUB_BASE_REF --logger-github --ignore-msi-with-no-mutations --only-covered

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