Fix copy and paste error in comment.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8588 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/allformats.c

@@ -31,7 +31,7 @@
    formats you want to support */
 
 /**
- * Initialize libavcodec and register all the codecs and formats.
+ * Initialize libavformat and register all the (de)muxers and protocols.
  */
 void av_register_all(void)
 {