示例代码中border属性单位值删除

Signed-off-by: N王鑫 <xinwangih@isoftstone.com>

zh-cn/application-dev/reference/arkui-ts/ts-universal-attributes-border.md

@@ -88,7 +88,7 @@ struct BorderExample {
         .width(300)
         .height(300)
         .border({
-          width: { left: 5, right: 10, top: 20, bottom: 30 },
+          width: { left: 3, right: 6, top: 10, bottom: 15 },
           color: { left: '#e3bbbb', right: Color.Blue, top: Color.Red, bottom: Color.Green },
           radius: { topLeft: 10, topRight: 20, bottomLeft: 40, bottomRight: 80 },
           style: {