Update documentation.yml

separate steps of docs job by new line for readability

.github/workflows/documentation.yml

@@ -11,12 +11,15 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
+
       - name: Install dependencies
         run: |
           pip install sphinx sphinx_rtd_theme myst_parser piccolo_theme
+          
       - name: Sphinx build
         run: |
           sphinx-build doc _build
+          
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}