update badge style

components/badge/demo/basic.md

@@ -16,7 +16,7 @@ React.render(
 , document.getElementById('components-badge-demo-basic'));
 ````
 
-<style>
+````css
 .ant-badge {
   margin-right: 16px;
 }
@@ -27,4 +27,4 @@ React.render(
   background: #eee;
   display: inline-block;
 }
-</style>
+````

components/badge/demo/dot.md

@@ -9,11 +9,14 @@
 ````jsx
 var Badge = antd.Badge;
 
-React.render(
+React.render(<div>
   <Badge dot={true}>
     <i className="anticon anticon-notification"></i>
   </Badge>
-, document.getElementById('components-badge-demo-dot'));
+  <Badge dot={true}>
+    <a href="#">一个链接</a>
+  </Badge>
+</div>, document.getElementById('components-badge-demo-dot'));
 ````
 
 <style>

style/components/badge.less

@@ -3,6 +3,7 @@
 .@{badge-prefix-cls} {
   position: relative;
   display: inline-block;
+  line-height: 1;
 
   &-count {
     position: absolute;