[css-overflow-3][editorial] Link fixes.

Author: fantasai

css-overflow-3/Overview.bs

@@ -414,7 +414,7 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 			whether or not any of its content is clipped.
 			This avoids any problem with scrollbars appearing
 			and disappearing in a dynamic environment.
-			When the target medium is ''print'',
+			When the target medium is ''@media/print'',
 			overflowing content may be printed;
 			it is not defined where it may be printed.
 
@@ -593,7 +593,7 @@ Expanding Clipping Bounds: the 'overflow-clip-margin' property</h3>
 		::
 			Specifies the box edge to use as the [=overflow clip edge=] origin,
 			i.e. when the specified offset is zero.
-			Defaults to ''padding-box'' if omitted.
+			Defaults to ''overflow-clip-margin/padding-box'' if omitted.
 
 		: <dfn><<length [0,∞]>></dfn>
 		::
@@ -621,13 +621,13 @@ Overflow Viewport Propagation</h3>
 
 	UAs must apply the 'overflow-*' values
 	set on the root element to the <a>viewport</a>
-	when the root element’s 'display' value is not ''none''.
+	when the root element’s 'display' value is not ''display/none''.
 	However,
 	when the root element is an [[!HTML]] <{html}> element
 	(including <a href="https://html.spec.whatwg.org/multipage/introduction.html#html-vs-xhtml">XML syntax for HTML</a>)
 	whose 'overflow' value is ''overflow/visible'' (in both axes),
 	and that element has as a child
-	a <{body}> element whose 'display' value is also not ''none'',
+	a <{body}> element whose 'display' value is also not ''display/none'',
 	user agents must instead apply the 'overflow-*' values
 	of the first such child element to the viewport.
 	The element from which the value is propagated must then have