Merge pull request #1821 from javiereguiluz/fix_bundle_config

Author: ostrolucky

.symfony.bundle.yaml

@@ -11,6 +11,6 @@ branches:
 maintained_branches:
     - "2.12.x"
     - "2.13.x"
-doc_dir: "docs/"
+doc_dir: { "2.12.x": "docs/", "2.13.x": "docs/en/" }
 current_branch: "2.12.x"
 dev_branch: "2.13.x"