[css-position-4] Gloss in-flow jargon (w3c#11526)

Author: cvrebert

css-position-4/Overview.bs

@@ -557,7 +557,7 @@ with its top left corner at the canvas origin.
 		then [=tree order=],
 		and [=paint a stacking context=] given each descendant and |canvas|.
 
-	1. For each of |root|'s in-flow, non-positioned, block-level descendants,
+	1. For each of |root|'s [=in-flow=], non-positioned, block-level descendants,
 		in [=tree order=],
 		[=paint a block's decorations=]
 		given the descendant and |canvas|.
@@ -578,7 +578,7 @@ with its top left corner at the canvas origin.
 
 			: Otherwise
 			:: First for |root|,
-				then for all its in-flow, non-positioned, [=block-level=] descendant boxes,
+				then for all its [=in-flow=], non-positioned, [=block-level=] descendant boxes,
 				in [=tree order=]:
 
 				1. If the box is a [=replaced element=],
@@ -669,7 +669,7 @@ with its top left corner at the canvas origin.
 
 	3. <dl class=switch>
 			: If |root| is an [=inline box=]
-			:: For all |root|'s in-flow, non-positioned, inline-level children
+			:: For all |root|'s [=in-flow=], non-positioned, inline-level children
 				that generate [=fragments=] in |line box|,
 				and all child [=CSS/text sequences=]
 				that generate [=fragments=] in |line box|,