Remove filename from doxy comment

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23585 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/ra144enc.c

@@ -20,7 +20,7 @@
  */
 
 /**
- * @file libavcodec/ra144enc.c
+ * @file
  * Real Audio 1.0 (14.4K) encoder
  * @author Francesco Lavra <francescolavra@interfree.it>
  */