small wording fix

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23277 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

Changelog

@@ -5,7 +5,7 @@ releases are sorted from youngest to oldest.
 version <next>:
 
 - WebM support in Matroska demuxer
-- low overhead in Ogg muxing
+- low overhead Ogg muxing