Updated 远程教学之画板相关消息 (markdown)

@@ -10,7 +10,7 @@
 ```
    type:templateAction
    subtype:drawingBoard
-   command:openDrawBoard
+   command:open
    attachmentType:image
 ```
 附加的附件是教师版当前页面的截图
@@ -19,14 +19,14 @@
 ```
    type:templateAction
    subtype:drawingBoard
-   command:closeDrawBoard
+   command:close
 ```
 
-* 更换画笔
+* 更换颜色
 ```
    type:templateAction
    subtype:drawingBoard
-   command:changeBrush
+   command:changeColor
 ```
 
 * Undo操作