argh s/ffmpeg/snow/

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11466 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

doc/snow.txt

@@ -312,7 +312,7 @@ FIXME
 The implemented range coder is an adapted version based upon "Range encoding:
 an algorithm for removing redundancy from a digitised message." by G. N. N.
 Martin.
-The symbols encoded by the ffmpeg range coder are bits (0|1). The
+The symbols encoded by the snow range coder are bits (0|1). The
 associated probabilities are not fix but change depending on the symbol mix
 seen so far.