minor typo fixes

Originally committed as revision 12658 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/8svx.c

 /*
- * 8SVX Audio Decoder
+ * 8SVX audio decoder
  * Copyright (C) 2008 Jaikrishnan Menon
  *
  * This file is part of FFmpeg.

libavformat/avio.h

@@ -269,7 +269,7 @@ int get_buffer(ByteIOContext *s, unsigned char *buf, int size);
 
 /**
  * Reads size bytes from ByteIOContext into buf.
- * This reads at most 1 packet. If that's not enough fewer bytes will be
+ * This reads at most 1 packet. If that is not enough fewer bytes will be
  * returned.
  * @returns number of bytes read or AVERROR
  */

libavformat/iff.c

 /*
- * Iff (.iff) File Demuxer
+ * IFF (.iff) file demuxer
  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
  *
  * This file is part of FFmpeg.
@@ -21,7 +21,7 @@
 
 /**
  * @file iff.c
- * iff file demuxer
+ * IFF file demuxer
  * by Jaikrishnan Menon
  * for more information on the .iff file format, visit:
  * http://wiki.multimedia.cx/index.php?title=IFF