3rd attempt at 8.0.0a1

.github/workflows/docs.yml

@@ -18,10 +18,11 b' jobs:'
         sudo apt-get install graphviz
     - name: Install Python dependencies
       run: |
-        python -m pip install --upgrade pip setuptools coverage
+        python -m pip install --upgrade pip setuptools coverage rstvalidator
         pip install -r docs/requirements.txt
     - name: Build docs
       run: |
+        python -m rstvalidator long_description.rst
         python tools/fixup_whats_new_pr.py
         make -C docs/ html SPHINXOPTS="-W" \
           PYTHON="coverage run -a" \