Update 4.storage-config.md (#1919)

docs-2.0/5.configurations-and-logs/1.configurations/4.storage-config.md

@@ -109,6 +109,7 @@ For all parameters and their current values, see [Configurations](1.configuratio
 
 | Name | Predefined value | Description |
 | :-- | :----- | :--- |
+| `query_concurrently` |`true`| Whether to turn on multi-threaded queries. Enabling it can improve the latency performance of individual queries, but it will reduce the overall throughput under high pressure. |
 | `auto_remove_invalid_space` | `true` |After executing `DROP SPACE`, the specified graph space will be deleted. This parameter sets whether to delete all the data in the specified graph space at the same time. When the value is `true`, all the data in the specified graph space will be deleted at the same time.|
 | `num_io_threads` | `16` | The number of network I/O threads used to send RPC requests and receive responses. |
 | `num_worker_threads` | `32` | The number of worker threads for one RPC-based Storage service. |