update README.md.

Signed-off-by: KevinDuan <duankaiwen@ubuntukylin.com>

README.md

@@ -34,7 +34,7 @@ openkylin系统主题模块致力为整个操作系统提供优质装扮服务
 | ![输入图片说明](img/image3.png)  | cross  |
 | ![输入图片说明](img/image4.png)  | ibeam  |
 | ![输入图片说明](img/image5.png)  | watch  |
-| ![输入图片说明](img/image6.png)  | left_ptr_watch  |
+| ![输入图片说明](img/image6.png) | left_ptr_watch  |
 | ![输入图片说明](img/image7.png)  | forbidden  |
 | ![输入图片说明](img/image8.png)  | pointing_hand  |
 | ![输入图片说明](img/image9.png)  | whats_this  |
@@ -49,7 +49,7 @@ openkylin系统主题模块致力为整个操作系统提供优质装扮服务
 | ![输入图片说明](img/image18.png)  | closedhand  |
 | ![输入图片说明](img/image19.png) | dnd-move or move  |
 | ![输入图片说明](img/image20.png)  | dnd-copy or copy  |
-|   | dnd-link or link  |
+| ![输入图片说明](img/image21.png)  | dnd-link or link  |
 
 
 ##### 壁纸主题