fix: ci config

Author: jeffydc

.github/workflows/docs.yml

@@ -81,4 +81,6 @@ jobs:
 
       - name: make doctest
         working-directory: ./docs/
-        run: make doctest --jobs 2 SPHINXOPTS="--color -W"
+        run: |
+          make doctest SPHINXOPTS="--color -W"
+          make coverage