Update sphinx.yml

discrepancy between inputs led to no doc build found (for monorepo)

.github/workflows/sphinx.yml

@@ -35,12 +35,12 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: ${{ inputs.project-root == '.' && github.event.repository.name || inputs.project-root }}_docs
-          path: ${{ github.workspace }}/${{ inputs.path-to-doc }}
+          path: ${{ github.workspace }}/${{ inputs.project-root }}/${{ inputs.path-to-doc }}
 
       - name: Upload to github pages
         # only publish doc changes from main branch
         if: github.ref == 'refs/heads/main'
         uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./${{ inputs.path-to-doc }}
+          publish_dir: ./${{ inputs.project-root }}/${{ inputs.path-to-doc }}