Fix error in put inference example (#5167)

Author: lcawl

output/openapi/elasticsearch-openapi.json

@@ -6,9 +6,10 @@ value: |-
    "service_settings": {
      "model_id": "rerank-english-v3.0",
      "api_key": "{{COHERE_API_KEY}}"
-   }
+   },
    "chunking_settings": {
      "strategy": "recursive",
      "max_chunk_size": 200,
      "separator_group": "markdown"
+   }
   }