Clarify use of UIManager for LayoutAnimation on Android

https://facebook.github.io/react-native/docs/layoutanimation.html

This page says the following:

Note that in order to get this to work on Android you need to set the following flags via UIManager:
UIManager.setLayoutAnimationEnabledExperimental && UIManager.setLayoutAnimationEnabledExperimental(true);

What is unclear is if this needs to be done once globally, or on a per component basis. This should be made clearer.

打开链接的 LayoutAnimation 文档页面，找到关于通过 UIManager 启用 Android 支持的注释。明确 setLayoutAnimationEnabledExperimental(true) 是一次性全局配置，还是按组件配置，然后确认更新后的措辞直接回答了这个问题。