!22166 修改loadingprogress组件示例代码，使示例代码的实际效果与示例图片效果保持一致

Merge pull request !22166 from zhangDH/loadingprogess

zh-cn/application-dev/reference/arkui-ts/ts-basic-components-loadingprogress.md

@@ -45,6 +45,7 @@ struct LoadingProgressExample {
       Text('Orbital LoadingProgress ').fontSize(9).fontColor(0xCCCCCC).width('90%')
       LoadingProgress()
         .color(Color.Blue)
+        .layoutWeight(1)
     }.width('100%').margin({ top: 5 })
   }
 }