[css-overflow-3] Gloss in-flow/out-of-flow jargon

Author: cvrebert

css-overflow-3/Overview.bs

@@ -277,11 +277,11 @@ Scrollable Overflow</h3>
 			within the [=scrollable overflow rectangle=],
 			the box’s own padding
 			so that when its content is scrolled to its end,
-			there is padding between the edge of its in-flow (or floated) content
+			there is padding between the edge of its [=in-flow=] (or floated) content
 			and the border edge of the box.
 			It typically ends up being exactly the same size as the box's own padding,
 			except in a few cases--
-			such as when an out-of-flow positioned element,
+			such as when an [=out-of-flow=] positioned element,
 			or the visible overflow of a descendent,
 			has already increased the size of the [=scrollable overflow rectangle=]
 			outside the conceptual “content edge” of the [=scroll container=]’s content.