update list-view.test.js 添加注释

pages/component/list-view/list-view.test.js

@@ -46,6 +46,7 @@ describe('component-native-list-view', () => {
     expect(scrollDetail.scrollHeight).toBeGreaterThan(0)
     expect(scrollDetail.scrollWidth).toBeGreaterThan(0)
     expect(scrollDetail.deltaX).toBe(0)
+    //此处可判断安卓issues:9121的问题
     expect([300, 299.8095]).toContain(scrollDetail.deltaY);
     expect(await page.data('isScrollTest')).toBe('scroll:Success')
   })