Refactor: Change update doc from PUT to patch (#14067)

### What problem does this PR solve?

Before change, update_document in api/apps/restful_apis/document_api.py
is using "PUT".
After change, it will use "PATCH" which is more suitable.

### Type of change

- [x] Refactoring

sdk/python/ragflow_sdk/modules/document.py

@@ -54,7 +54,7 @@ class Document(Base):
         if "meta_fields" in update_message:
             if not isinstance(update_message["meta_fields"], dict):
                 raise Exception("meta_fields must be a dictionary")
-        res = self.put(f"/datasets/{self.dataset_id}/documents/{self.id}", update_message)
+        res = self.patch(f"/datasets/{self.dataset_id}/documents/{self.id}", update_message)
         res = res.json()
         if res.get("code") != 0:
             raise Exception(res["message"])