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

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@15395 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/asf-enc.c

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