When insert /**/ comment in a C-src block, "," will be insert automticlly before * as flow:

Reproduce:

1. Create one new .org file

2. Insert this content:

   #+BEGIN_SRC C  
   /** @file  main.c
    * @brief  项目主函数文件
    * @details 主要包含协议应用栈程序框架，main函数入口
    * @author 李长条
    * @copyright Copyright (c) 2050
    */
   #+END_SRC
   

3. In this block, type C-c ',which will call "org-edit-special"
4. In the opened *Org Src * buffer, do nothing and type C-c ' again
5. Then the "," are inserted in org file as shown in previous picture.