message: identify outlier_detection correctly as an object in the high-level config overview
diff: @@ -20,7 +20,7 @@ Cluster
  "features": "...",
  "http_codec_options": "...",
  "dns_refresh_rate_ms": "...",
  - "outlier_detection": "..."
  + "outlier_detection": "{...}"
  }
  .. _config_cluster_manager_cluster_name:
  