docs: add controllerd sample (#3504)

* add controllerd sample

* lint

components/mention/demo/controllder-simple.md

@@ -0,0 +1,41 @@
+---
+order: 3
+title:
+  zh-CN: 受控模式
+  en-US: Controlled
+---
+
+## zh-CN
+
+受控模式.
+
+## en-US
+
+Controlled mode.
+
+````jsx
+import { Mention } from 'antd';
+const { toEditorState } = Mention;
+
+const App = React.createClass({
+  getInitialState() {
+    return {
+      value: toEditorState('@afc163'),
+    };
+  },
+  handleChange(editorState) {
+    this.setState({
+      value: editorState,
+    });
+  },
+  render() {
+    return (<Mention
+      suggestions={['afc163', 'benjycui', 'yiminghe', 'RaoHai', '中文', 'にほんご']}
+      value={this.state.value}
+      onChange={this.handleChange}
+    />);
+  },
+});
+
+ReactDOM.render(<App />, mountNode);
+````

components/mention/demo/controlled.md

@@ -1,8 +1,8 @@
 ---
-order: 3
+order: 4
 title:
-  zh-CN: 受控模式
-  en-US: Controlled
+  zh-CN: 配合 Form 使用
+  en-US: With Form
 ---
 
 ## zh-CN

components/mention/demo/multilines.md

@@ -1,5 +1,5 @@
 ---
-order: 4
+order: 5
 title:
   zh-CN: 多行
   en-US: Multi-lines Mode