[Doc] fix links (#3663)

src/area/README.md

@@ -100,7 +100,7 @@ Example of `AreaList`
 }
 ```
 
-All code of China: [Area.json](https://github.com/youzan/vant/blob/dev/packages/area/demo/area-en.js)
+All code of China: [Area.json](https://github.com/youzan/vant/blob/dev/src/area/demo/area-en.js)
 
 ### argument of callback function confirm
 

src/area/README.zh-CN.md

@@ -105,7 +105,7 @@ Vue.use(Area);
 }
 ```
 
-完整数据见 [Area.json](https://github.com/youzan/vant/blob/dev/packages/area/demo/area.js)
+完整数据见 [Area.json](https://github.com/youzan/vant/blob/dev/src/area/demo/area.js)
 
 ### 点击完成时返回的数据格式
 

src/locale/README.md

@@ -45,4 +45,4 @@ Current supported languages:
 | English | en-US |
 | Turkish | tr-TR |
 
-View all language configs [Here](https://github.com/youzan/vant/tree/dev/packages/locale/lang).
+View all language configs [Here](https://github.com/youzan/vant/tree/dev/src/locale/lang).

src/locale/README.zh-CN.md

@@ -45,4 +45,4 @@ Locale.add(messages);
 | 英语 | en-US |
 | 土耳其语 | tr-TR |
 
-在 [这里](https://github.com/youzan/vant/tree/dev/packages/locale/lang) 查看所有的 i18n 配置文件。
+在 [这里](https://github.com/youzan/vant/tree/dev/src/locale/lang) 查看所有的 i18n 配置文件。