[css-backgrounds-4][editorial] Gloss in-flow jargon

Author: cvrebert

css-backgrounds-4/Overview.bs

@@ -1035,7 +1035,7 @@ Painting Area: the 'background-clip' property</h3>
 		<dd>
 			The background is painted within (clipped to)
 			the intersection of the border box
-			and the geometry of the text in the element and its in-flow and floated descendants.
+			and the geometry of the text in the element and its [=in-flow=] and floated descendants.
 
 		<dt><dfn>border-area</dfn></dt>
 		<dd>