ASF stands for "advanced stream format" not "adaptive ...", changing it to "ASF".

Originally committed as revision 15395 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/asf-enc.c

 /*
- * Adaptive stream format muxer
+ * ASF muxer
  * Copyright (c) 2000, 2001 Fabrice Bellard.
  *
  * This file is part of FFmpeg.