fix code style

doc/NEW_WEB_SERVICE.md

 # How to develop a new Web service?
 
+
 ([简体中文](NEW_WEB_SERVICE_CN.md)|English)
 
 This document will take Uci service as an example to introduce how to develop a new Web Service. You can check out the complete code [here](../python/examples/pipeline/simple_web_service/web_service.py).
@@ -147,4 +148,4 @@ op:
             ir_optim: false # ir optimization option, the default is false
 ```
 
-All fields of Op can be defined when Op is created in the program (which will override yaml fields).
\ No newline at end of file
+All fields of Op can be defined when Op is created in the program (which will override yaml fields).

doc/NEW_WEB_SERVICE_CN.md

 # 如何开发一个新的Web Service？
 
+
 (简体中文|[English](NEW_WEB_SERVICE.md))
 
 本文档将以 Uci 房价预测服务为例，来介绍如何开发一个新的Web Service。您可以在[这里](../python/examples/pipeline/simple_web_service/web_service.py)查阅完整的代码。
@@ -147,4 +148,4 @@ op:
             ir_optim: false # ir 优化选项，默认为 false
 ```
 
-其中，Op 的所有字段均可以在程序中创建 Op 时定义（会覆盖 yaml 的字段）。
\ No newline at end of file
+其中，Op 的所有字段均可以在程序中创建 Op 时定义（会覆盖 yaml 的字段）。