[css-overflow-3] overflow only applies to replaced elements in L4

Author: fantasai

css-overflow-3/Overview.bs

@@ -468,14 +468,13 @@ Managing Overflow: the 'overflow-x', 'overflow-y', and 'overflow' properties</h3
 	(i.e. the other axis is ''overflow/clip''),
 	the box is a [=single-axis scroll container=].
 
-	On [=replaced elements=],
-	a [=computed value|computed=] ''overflow/hidden'' value further resolves
-	to a [=used value=] of ''overflow/clip''.
-
 	User agents must also support
 	the <dfn value for="overflow, overflow-x, overflow-y, overflow-block, overflow-inline">overlay</dfn> keyword
 	as a [=legacy value alias=] of ''overflow/auto''.
 
+	Note: The 'overflow' properties are expanded to apply to [=replaced elements=]
+	in <a href="http://www.w3.org/TR/css-overflow-4/">Level 4</a>.
+
 <h4 id="scroll-visibility">
 Interaction of 'visibility' and 'overflow'</h4>