[css-position-4][editorial] 'fake stacking context' -> 'stacking container', per fantasai suggestion

Author: tabatkins

css-position-4/Overview.bs

@@ -118,7 +118,7 @@ with its top left corner at the canvas origin.
 
 	1. For each of |root|'s non-positioned floating descendants,
 		in tree order,
-		[=paint a fake stacking context=]
+		[=paint a stacking container=]
 		given the descendant and |canvas|.
 
 	1.
@@ -155,7 +155,7 @@ with its top left corner at the canvas origin.
 
 		<dl class=switch>
 			: descendant has ''z-index: auto''
-			:: [=Paint a fake stacking context=]
+			:: [=Paint a stacking container=]
 				given the descendant and |canvas|.
 
 			: descendant has ''z-index: 0''
@@ -266,7 +266,7 @@ with its top left corner at the canvas origin.
 						and |canvas|.
 
 			: If |root| is an [=inline-level=] [=block box|block=] or [=table wrapper box=]
-			:: [=Paint a fake stacking context=]
+			:: [=Paint a stacking container=]
 				given |root| and |canvas|.
 
 			: If |root| is an [=inline-level=] replaced element
@@ -280,7 +280,7 @@ with its top left corner at the canvas origin.
 </div>
 
 <div algorithm>
-	To <dfn>paint a fake stacking context</dfn>,
+	To <dfn>paint a stacking container</dfn>,
 	given a [=box=] |root|
 	and a canvas |canvas|: