[css-overflow-3] Move note, refocus it on what it doesn't affect because that's what's not obvious. w3c#5800

Author: fantasai

css-overflow-3/Overview.bs

@@ -518,7 +518,7 @@ Expanding Clipping Bounds: the 'overflow-clip-margin' property</h3>
 	i.e. precisely <em>how far</em> outside its bounds
 	the box’s content is allowed to paint
 	before being clipped
-	by effects (such as ''overflow: clip'')
+	by effects (such as ''overflow: clip'', above)
 	that are defined to clip to the box’s [=overflow clip edge=].
 
 	The [=overflow clip edge=] initially coincides with the [=padding edge=],
@@ -535,12 +535,13 @@ Expanding Clipping Bounds: the 'overflow-clip-margin' property</h3>
 			due to a positive spread distance
 			(including the effect on rounded corners).
 			Negative values are invalid.
-
-			Note: If the element does not have ''overflow: clip''
-			(or another property defined to use the [=overflow clip edge=]),
-			this property has no effect.
 	</dl>
 
+
+	Note: This property has no effect on boxes
+	with ''overflow: hidden'' or ''overflow: scroll'',
+	which are not defined to use the [=overflow clip edge=].
+
 <h3 id="overflow-propagation">
 Overflow Viewport Propagation</h3>