Fix: Change the field name of the document ID from "documents" to "do… (#6753)

…cument_ids" to maintain consistency.

### What problem does this PR solve?

Close #6752

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Co-authored-by: wenju.li <wenju.li@deepctr.cn>

sdk/python/ragflow_sdk/ragflow.py

@@ -170,7 +170,7 @@ class RAGFlow:
                 "keyword": keyword,
                 "question": question,
                 "dataset_ids": dataset_ids,
-                "documents": document_ids
+                "document_ids": document_ids
             }
             # Send a POST request to the backend service (using requests library as an example, actual implementation may vary)
             res = self.post('/retrieval',json=data_json)