fix info of max_result_set_writers

docs/config-parameters-en.md

@@ -81,7 +81,7 @@ Target component
 |enable_join_scan| Boolean (true/false) | Whether to enable `join_scan`, an operator that scans and searches for candidates using a portion (prefix) of the data in an index-join process, when the data for the whole key columns are not available. Effective only if `enable_index_join=true`. The default value is true. | This is for development and may be deleted in the future. |
 |dev_rtx_key_distribution| String | Specifies the method used to split key range used by RTX parallel scan. Choose one of the following `simple`, `uniform`, or `sampling`. Valid only if `dev_rtx_parallel_scan=true`. Default is `uniform` | This is for development and may be deleted in the future. |
 |dev_enable_blob_cast| Boolean (true/false) | Whether to enable cast expression with BLOB/CLOB. The default value is false.| This is for development and may be deleted in the future.|
-| `max_result_set_writers` | Integer | The value must be equal to or less than 256 |
+| `max_result_set_writers` | Integer | The maximum number of writer resultset. The default value is 64. | The value must be equal to or less than 256. |
 
 ## ipc_endpoint section