[css-overflow-3] Editorial tweak.

Author: frivoal

css-overflow-3/Overview.bs

@@ -573,7 +573,7 @@ Indicating Block-Axis Overflow: the 'block-overflow' property</h2>
 	<dl dfn-for="block-overflow" dfn-type=value>
 		<dt><dfn>clip</dfn>
 		<dd>
-			The content is not altered.
+			The rendering is unaffected.
 
 		<dt><dfn>ellipsis</dfn>
 		<dd>