fix workflow

Author: yosupo06

.github/workflows/document.yml

@@ -32,4 +32,4 @@ jobs:
         with:
           deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
           publish_dir: ./tools/generated
-          destination_dir: ${( steps.branch.outputs.BRANCH_NAME )}
+          destination_dir: ${{ steps.branch.outputs.BRANCH_NAME }}