Remove extra word.

Originally committed as revision 11464 to svn://svn.ffmpeg.org/ffmpeg/trunk

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 encoded symbols encoded by the ffmpeg range coder are bits (0|1). The
+The symbols encoded by the ffmpeg range coder are bits (0|1). The
 associated probabilities are not fix but change depending on the symbol mix
 seen so far.