Fix doxygen comment

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19823 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/atrac.h

@@ -21,8 +21,8 @@
  */
 
 /**
- * @file libavcodec/atrac1data.h
- * Atrac 1 compatible decoder data
+ * @file libavcodec/atrac.h
+ * Atrac common header
  */
 
 #ifndef AVCODEC_ATRAC_H