update scroll-view.md

docs/component/scroll-view.md

@@ -67,7 +67,7 @@
 
 **嵌套滚动策略：**
 
-当向下滚动时，先滚动外层 scroll-view 再滚动内层 scroll-view；当向上滚动时，先滚动内层 scroll-view 再滚动外层 scroll-view
+当向下滚动（手指向上滑动）时，先滚动外层 scroll-view 再滚动内层 scroll-view；当向上滚动（手指向下滑动）时，先滚动内层 scroll-view 再滚动外层 scroll-view
 
 **注意事项：**
 + 4.11版本开始支持嵌套模式