Update API document (#14364)

### What problem does this PR solve?

Update API document

### Type of change

- [ ] Documentation Update

docs/references/http_api_reference.md

@@ -7323,16 +7323,16 @@ or
 ##### Request example
 
 ```bash
-curl --request POST \
+curl --request POST \
      --url http://{address}/api/v1/files/link-to-datasets \
-     --header 'Content-Type: application/json' \
+     --header 'Content-Type: application/json' \
      --header 'Authorization: Bearer <YOUR_API_KEY>' \
      --data '{
           "file_ids": ["file_id_1", "file_id_2"],
           "kb_ids": ["dataset_id_1", "dataset_id_2"]
      }'
 ```
-
+
 ##### Request parameters
 
 - `"file_ids"`: (*Body parameter*), `list[string]`, *Required*
@@ -7344,7 +7344,7 @@ Converts files to documents and links them to specified datasets.
 
 Success:
 
-```json
+```json
 {
     "code": 0,
     "data": [