[css-ruby] Fix typo

Author: frivoal

css-ruby-1/Overview.bs

@@ -1283,7 +1283,7 @@ Ruby Text Distribution: the 'ruby-align' property</h3>
 		between every adjacent pair of CJK [=characters=]
 		but not between adjacent pairs of Latin [=characters=],
 		the ''space-around'' and ''space-between'' values
-		will nevertheles result in narrow characters centered:
+		will nevertheless result in narrow characters centered:
 		<div class="figure">
 			<img width="145" height="91"
 			     alt="Diagram of glyph layout in auto aligned ruby when halfwidth ruby text is shorter than base"