!15559 修改responsive-layout.md文件

Merge pull request !15559 from fanzhaonan/master

zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md

@@ -317,7 +317,7 @@ struct GridRowSample1 {
   @State private currentBreakpoint: string = 'unknown'
   build() {
     // 修改断点的取值范围同时启用更多断点，注意，修改的断点值后面必须加上vp单位。
-    GridRow(breakpoints: {value: ['600vp', '700vp', '800vp', '900vp', '1000vp'],
+    GridRow({breakpoints: {value: ['600vp', '700vp', '800vp', '900vp', '1000vp'],
       reference: BreakpointsReference.WindowSize}}) {
       GridCol({span:{xs: 12, sm: 12, md: 12, lg:12, xl: 12, xxl:12}}) {
         Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {