fix typo

Signed-off-by: Jimmie Han <hanjinming@outlook.com>

docs/storage.md

@@ -422,7 +422,7 @@ config:
 
 The `secret_key` and `secret_id` field is required. The `http_config` field is optional for optimize HTTP transport settings. There are two ways to configure the required bucket information:
 1. Provide the values of `bucket`, `region` and `app_id` keys.
-2. Provide the values of `endpoint` key with url format when you want to specific vpc internal endpoint. Please refer to the document of [endpoint](https://intl.cloud.tencent.com/document/product/436/6224) for more detail.
+2. Provide the values of `endpoint` key with url format when you want to specify vpc internal endpoint. Please refer to the document of [endpoint](https://intl.cloud.tencent.com/document/product/436/6224) for more detail.
 
 Set the flags `--objstore.config-file` to reference to the configuration file.