[css-lists-3] Clarify that marker-side only applies to outside markers. w3c#5307

Author: fantasai

css-lists-3/Overview.bs

@@ -647,7 +647,7 @@ The 'marker-side' property</h3>
 	</pre>
 
 	The 'marker-side' property specifies
-	whether the ''::marker'' is positioned
+	whether an ''list-style-position/outside'' [=marker box=] is positioned
 	based on the directionality of the list item itself (i.e. its [=originating element=])
 	or the directionality of the list container (i.e. the [=originating element=]’s parent).
 	In the first case, the position of the marker can vary across items in the same list,
@@ -658,12 +658,12 @@ The 'marker-side' property</h3>
 	<dl dfn-type=value dfn-for=marker-side>
 		<dt><dfn>match-self</dfn>
 		<dd>
-			The ''::marker'' pseudo-element is positioned
+			The [=marker box=] is positioned
 			using the directionality of the ''::marker''’s [=originating element=].
 
 		<dt><dfn>match-parent</dfn>
 		<dd>
-			The ''::marker'' pseudo-element is positioned
+			The [=marker box=] is positioned
 			using the directionality of the ''::marker''’s [=originating element’s=] parent element.
 	</dl>