update request comment

src/utils/request.js

@@ -1,6 +1,6 @@
 /**
  * request 网络请求工具
- * 更详细的api文档: https://bigfish.alipay.com/doc/api#request
+ * 更详细的 api 文档: https://github.com/umijs/umi-request
  */
 import { extend } from 'umi-request';
 import { notification } from 'antd';