Fix YAML syntax error

Author: atextor

site.yml

@@ -14,7 +14,8 @@ content:
      - url: https://github.com/eclipse-esmf/esmf-sdk
        branches: HEAD
        tags: ["v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.2"]
-       start_path: documentation/developer-guide - url: https://github.com/eclipse-esmf/esmf-aspect-model-editor
+       start_path: documentation/developer-guide
+     - url: https://github.com/eclipse-esmf/esmf-aspect-model-editor
        branches: HEAD
        tags: ["v5.6.1","v5.6.0","v5.5.0"]
        start_path: documentation/ame-guide