update some demo

components/message/demo/duration.md

@@ -7,11 +7,11 @@ title:
 
 ## zh-CN
 
-自定义时长 `10s`，默认时长为 `1.5s`。
+自定义时长 `10s`，默认时长为 `3s`。
 
 ## en-US
 
-Customize message display duration from default `1.5s` to `10s`.
+Customize message display duration from default `3s` to `10s`.
 
 ````jsx
 import { message, Button } from 'antd';

components/spin/__tests__/__snapshots__/demo.test.js.snap

@@ -26,6 +26,7 @@ exports[`renders ./components/spin/demo/delayAndDebounce.md correctly 1`] = `
       <div
         class="ant-alert ant-alert-info ant-alert-with-description ant-alert-no-icon"
         data-show="true"
+        style="margin-bottom:16px;"
       >
         <span
           class="ant-alert-message"

components/spin/demo/delayAndDebounce.md

@@ -27,6 +27,7 @@ class Card extends React.Component {
         message="Alert message title"
         description="Further details about the context of this alert."
         type="info"
+        style={{ marginBottom: 16 }}
       />
     );
     return (