[css-lists] Stop putting the entire spec inside of a giant example.

Author: tabatkins

css-lists/Overview.bs

@@ -114,10 +114,6 @@ The ''::marker'' Pseudo-Element</h3>
 	Only a limited set of properties can be used on the ''::marker'' pseudo-element.
 	This list is defined in [[css-pseudo-4#marker-pseudo]].
 
-	<div class="example">
-		In the following example,
-		the content is centered within a marker box of a fixed width.
-
 	<div class="example">
 		In this example, markers are used to number paragraphs that are designated as "notes":