docs: update demo for: #6503

components/form/demo/coordinated.md

@@ -55,9 +55,11 @@ class App extends React.Component {
         >
           {getFieldDecorator('gender', {
             rules: [{ required: true, message: 'Please select your gender!' }],
-            onChange: this.handleSelectChange,
           })(
-            <Select placeholder="Select a option and change input text above">
+            <Select
+              placeholder="Select a option and change input text above"
+              onChange={this.handleSelectChange}
+            >
               <Option value="male">male</Option>
               <Option value="female">female</Option>
             </Select>