[css-ruby-1] Add line break.

Author: fantasai

css-ruby-1/Overview.bs

@@ -1272,7 +1272,8 @@ Overhanging Ruby</h3>
 	<div class="example">
 		The user agent may use [[JIS4051]] recommendation of
 		using one ruby text character length as the maximum overhang length.
-		Detailed rules for how ruby text can overhang adjacent characters for Japanese are described by [[JLREQ]].
+		Detailed rules for how ruby text can overhang adjacent characters
+		for Japanese are described by [[JLREQ]].
 	</div>
 
 <h3 id="line-edge">