Update copy foder doc.

Author: roywangaspose

docs/api/copy-folder.md

@@ -6,8 +6,8 @@
 - **Authentication Method**: `JWT (OAuth2, application)`  **Token URL**: `https://api.aspose.cloud/connect/token`
 - **Example Request**
 
-```markdown
-[![View Gist](https://gist.githubusercontent.com/aspose-cells-cloud-gists/8a5b324fdf3e574dbd747c1a1e24b05d/raw/Example40_CopyFolder.cs)](https://gist.githubusercontent.com/aspose-cells-cloud-gists/8a5b324fdf3e574dbd747c1a1e24b05d)
+```net
+https://gist.githubusercontent.com/aspose-cells-cloud-gists/8a5b324fdf3e574dbd747c1a1e24b05d/raw/Example40_CopyFolder.cs
 
 ```