Make rtsp_set_callback() comments available to Doxygen

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8257 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/rtsp.h

@@ -76,7 +76,7 @@ typedef int FFRTSPCallback(enum RTSPCallbackAction action,
                            char *buf, int buf_size,
                            void *arg);
 
-/* useful for modules: set RTSP callback function */
+/** useful for modules: set RTSP callback function */
 void rtsp_set_callback(FFRTSPCallback *rtsp_cb);
 
 int rtsp_init(void);