[css-overflow-3] Fix the replaced transform of overflow values to work on used values. w3c#7435

Author: tabatkins

css-overflow-3/Overview.bs

@@ -437,15 +437,10 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 			if there is overflow.
 		</dl>
 
-	On non-[=replaced=] elements,
-	the  ''visible''/''overflow/clip'' values of 'overflow'
+	The  ''visible''/''overflow/clip'' values of 'overflow'
 	compute to ''overflow/auto''/''hidden'' (respectively)
 	if one of 'overflow-x' or 'overflow-y' is neither ''visible'' nor ''overflow/clip''.
 
-	On [=replaced elements=],
-	all values other than ''visible''
-	compute to ''overflow/clip''.
-
 	If the computed value of 'overflow' on a <a>block box</a>
 	is neither ''overflow/visible'' nor ''overflow/clip'' nor a combination thereof,
 	it [=establishes an independent formatting context=] for its contents.
@@ -481,6 +476,11 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 	Choosing the appropriate behavior for each scrolling mechanism
 	is the responsibility of the UA.
 
+	On [=replaced elements=],
+	the [=used values=]
+	for all computed values other than ''visible''
+	become ''overflow/clip''.
+
 <h3 id="static-media">
 Overflow in Print and Other Static Media</h3>