Update .readthedocs.yaml

Co-authored-by: qodo-merge-pro[bot] <151058649+qodo-merge-pro[bot]@users.noreply.github.com>

Author: cgoldberg

.readthedocs.yaml

@@ -14,7 +14,7 @@ build:
   commands:
     - pip install -r py/docs/requirements.txt
     - pip install -r py/requirements.txt
-    - PYTHONPATH=py sphinx-autogen py/docs/source/api.rst
+    - PYTHONPATH=py sphinx-autogen -o $READTHEDOCS_OUTPUT/html py/docs/source/api.rst
     - sphinx-build -b html -d build/docs/doctrees py/docs/source $READTHEDOCS_OUTPUT/html
 
 sphinx: