Update WXPay_CN.md

doc/WXPay_CN.md

@@ -5,8 +5,7 @@
  
 ```dart
 import 'package:fluwx/fluwx.dart' as fluwx;
-fluwx.pay(WeChatPayModel(
-                  appId: 'wxd930ea5d5a258f4f', 
+fluwx.pay( appId: 'wxd930ea5d5a258f4f', 
                   partnerId: '1900000109',
                   prepayId: '1101000000140415649af9fc314aa427',
                   packageValue: 'Sign=WXPay',
@@ -15,7 +14,7 @@ fluwx.pay(WeChatPayModel(
                   sign: '7FFECB600D7157C5AA49810D2D8F28BC2811827B',
                   signType: '选填',
                   extData: '选填'
-                ));
+                );
 ```
 ### 返回值处理
 注：此返回值是此方法调用的直接返回值，并非支付之后的回调，回调请查看[相关文档](./RESPONSE.md)
@@ -27,4 +26,4 @@ fluwx.pay(WeChatPayModel(
        result:true //或者false，取决于WXApi.sendRequest()的结果
      }
 ```
-  
\ No newline at end of file
+