docs: Update demo (#39127)

components/select/demo/optgroup.md

@@ -17,22 +17,29 @@ Using `OptGroup` to group the options.
 import { Select } from 'antd';
 import React from 'react';
 
-const { Option, OptGroup } = Select;
-
 const handleChange = (value: string) => {
   console.log(`selected ${value}`);
 };
 
 const App: React.FC = () => (
-  <Select defaultValue="lucy" style={{ width: 200 }} onChange={handleChange}>
-    <OptGroup label="Manager">
-      <Option value="jack">Jack</Option>
-      <Option value="lucy">Lucy</Option>
-    </OptGroup>
-    <OptGroup label="Engineer">
-      <Option value="Yiminghe">yiminghe</Option>
-    </OptGroup>
-  </Select>
+  <Select
+    defaultValue="lucy"
+    style={{ width: 200 }}
+    onChange={handleChange}
+    options={[
+      {
+        label: 'Manager',
+        options: [
+          { label: 'Jack', value: 'jack' },
+          { label: 'Lucy', value: 'lucy' },
+        ],
+      },
+      {
+        label: 'Engineer',
+        options: [{ label: 'yiminghe', value: 'Yiminghe' }],
+      },
+    ]}
+  />
 );
 
 export default App;