Fix doc build (meta-pytorch#15)

Summary: Pull Request resolved: meta-pytorch#15

Differential Revision: D85487438

Author: tanquer

.github/workflows/docs.yaml

@@ -26,7 +26,7 @@ jobs:
           miniconda-version: "latest"
           activate-environment: test
           python-version: '3.10'
-          auto-activate: false
+          auto-activate: true
       - name: Verify conda environment
         shell: bash -l {0}
         run: |
@@ -56,7 +56,6 @@ jobs:
         working-directory: docs
         run: |
           set -eux
-          conda activate test
           make html SPHINXOPTS="-WT --keep-going" || echo "Build completed with warnings/errors"
       - name: Remove noindex meta tag from docs
         working-directory: docs/build/html