fix demo lint

components/modal/demo/button-props.md

@@ -18,23 +18,27 @@ import { Modal, Button } from 'antd';
 
 class App extends React.Component {
   state = { visible: false }
+
   showModal = () => {
     this.setState({
       visible: true,
     });
   }
+
   handleOk = (e) => {
     console.log(e);
     this.setState({
       visible: false,
     });
   }
+
   handleCancel = (e) => {
     console.log(e);
     this.setState({
       visible: false,
     });
   }
+
   render() {
     return (
       <div>

components/tree/demo/directory.md

@@ -15,6 +15,7 @@ Built-in directory tree. `multiple` support `ctrl(Windows)` / `command(Mac)` sel
 
 ````jsx
 import { Tree } from 'antd';
+
 const DirectoryTree = Tree.DirectoryTree;
 const TreeNode = Tree.TreeNode;
 
@@ -22,6 +23,7 @@ class Demo extends React.Component {
   onSelect = () => {
     console.log('Trigger Select');
   };
+
   onExpand = () => {
     console.log('Trigger Expand');
   };

components/upload/demo/directory.md

@@ -21,6 +21,6 @@ ReactDOM.render(
     <Button>
       <Icon type="upload" /> Upload Directory
     </Button>
-  </Upload>
-, mountNode);
+  </Upload>,
+  mountNode);
 ````