fix Icon.createFromIconfontCN usage

components/icon/index.en-US.md

@@ -98,12 +98,10 @@ This method is specified for [iconfont.cn](http://iconfont.cn/).
 
 ```js
 const MyIcon = Icon.createFromIconfontCN({
-  namespace: 'foo', // identifier
-  scriptUrl: 'at.alicdn.com/t/font_8d5l8fzk5b87iudi', // generated by iconfont.cn
-  prefix: 'icon-',
+  scriptUrl: '//at.alicdn.com/t/font_8d5l8fzk5b87iudi.js', // generated by iconfont.cn
 });
 
-ReactDOM.render(<MyIcon type="example" />, mountedNode);
+ReactDOM.render(<MyIcon type="icon-example" />, mountedNode);
 ```
 
 It create a component that uses SVG sprites in essence.

components/icon/index.zh-CN.md

@@ -102,12 +102,10 @@ ReactDOM.render(
 
 ```js
 const MyIcon = Icon.createFromIconfontCN({
-  namespace: 'foo', // identifier
   scriptUrl: '//at.alicdn.com/t/font_8d5l8fzk5b87iudi.js', // generated by iconfont.cn
-  prefix: 'icon-',
 });
 
-ReactDOM.render(<MyIcon type="example" />, mountedNode);
+ReactDOM.render(<MyIcon type="icon-example" />, mountedNode);
 ```
 
 其本质上是创建了一个使用 `<use>` 标签来渲染图标的组件。