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

Author: cvrebert

css-text-decor-3/Overview.bs

@@ -88,10 +88,10 @@ Line Decoration: Underline, Overline, and Strike-Through</h2>
 	When specified on or propagated to a <a>ruby container</a>,
 	the decorations are propagated only to the <a>ruby base</a>.
 	For all other box types,
-	the decorations are propagated to all in-flow children.
+	the decorations are propagated to all <a>in-flow</a> children.
 
 	<p class="note">
-		Note that text decorations are not propagated to any out-of-flow descendants,
+		Note that text decorations are not propagated to any <a>out-of-flow</a> descendants,
 		nor to the contents of atomic inline-level descendants such as inline blocks and inline tables.
 		They are also not propagated to inline children of inline boxes,
 		although the decoration is <em>applied</em> to such boxes.