Add docs to CI

Author: Gallaecio

Diff for: .github/workflows/checks.yml

@@ -17,6 +17,9 @@ jobs:
         - python-version: 3
           env:
             TOXENV: flake8
+        - python-version: "3.11"
+          env:
+            TOXENV: docs
 
     steps:
     - uses: actions/checkout@v2