[css-position-4][editorial] Fixed Bikeshed issue

Author: SebastianZ

css-position-4/Overview.bs

@@ -208,7 +208,7 @@ are rendered with the following qualities:
 	otherwise, it's the initial containing block.
 
 * If it is an element,
-	it and its ''::backdrop'' pseudo-element are not rendered
+	it and its ''::backdrop'' pseudo-element are [=element-not-rendered|not rendered=]
 	if its [=shadow-including inclusive ancestor=] has the ''display: none''.
 
 * If its specified 'display' property is ''display/contents'',
@@ -354,7 +354,7 @@ Top Layer Manipulation {#top-manip}
 
 	1. For each element |el| in |doc|'s [=pending top layer removals=]:
 		if |el|'s computed value of 'overlay' is ''none'',
-		or |el| is [=not rendered=],
+		or |el| is [=element-not-rendered|not rendered=],
 		[=remove from the top layer immediately=] |el|.
 
 	Note: This is intended to be called during the "Update the Rendering" step