!13851 修复Scroll示例代码运行后，ScrollBar遮挡部分Flex组件，与效果图不一致的问题

Merge pull request !13851 from 张荣杰/doc0120

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

@@ -64,7 +64,7 @@ struct ScrollBarExample {
                   .margin({ top: 5 })
               }
             }, item => item)
-          }.margin({ left: 52 })
+          }.margin({ right: 52 })
         }
         .scrollBar(BarState.Off)
         .scrollable(ScrollDirection.Vertical)