fix format error

Signed-off-by: Nkukixi <kouxinxin@huawei.com>

zh-cn/application-dev/ui/ui-ts-basic-components-button.md

@@ -136,7 +136,7 @@ Button('Ok', { type: ButtonType.Normal, stateEffect: true })
   
   @Entry
   @Component
-  struct ButtonExample {
+  struct ButtonCase1 {
     build() {
       List({ space: 4 }) {
         ListItem() {

zh-cn/application-dev/ui/ui-ts-layout-mediaquery.md

@@ -138,9 +138,8 @@ screen and (device-type: tv) or (resolution < 2) // 包含多个媒体特征
     }
   }
   ```
-横屏下文本内容为Landscape，颜色为#FFD700。</br>
+横屏下文本内容为Landscape，颜色为#FFD700。<br/>
 ![zh-cn_image_0000001262954829](figures/zh-cn_image_0000001262954829.png)
 
-
-非横屏下文本内容为Portrait，颜色为#DB7093。</br>
+非横屏下文本内容为Portrait，颜色为#DB7093。<br/>
 ![zh-cn_image_0000001263074739](figures/zh-cn_image_0000001263074739.png)