[css-lists-3] Drop unnecessary heading, now that we've dropped position: marker

Author: fantasai

css-lists-3/Overview.bs

@@ -535,25 +535,6 @@ Styling Markers: the 'list-style' shorthand property</h3>
 		since inheritance will transfer the 'list-style' value to the list items.
 	</div>
 
-
-<!--
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--->
-
-<h2 id='positioning'>
-Marker Positioning</h2>
-
-	<p class='issue'><strong>
-		This section is not ready for implementation.
-		It is an unreviewed rough draft that hasn't even been properly checked for Web-compatibility.
-		Feel free to send feedback, but DON'T USE THIS PART OF THE SPEC.</strong>
-
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