[css-display] Note that 'display: contents' does not affect property inheritance. Fixes w3c#1473

Author: fantasai

css-display/Overview.bs

@@ -517,7 +517,8 @@ Box Generation: the ''display/none'' and ''display/contents'' keywords</h3>
 
 			Note: As only the box tree is affected,
 			any semantics based on the document tree,
-			such as selector-matching and event handling,
+			such as selector-matching, event handling,
+			and property <a>inheritance</a>,
 			are not affected.
 
 			This value behaves as ''display: none'' on replaced elements