[css-lists] Use new terminology that's better

Author: fantasai

css-lists/Overview.src.html

@@ -362,7 +362,7 @@ <h2 id='marker-pseudo-element'>
 	Like ''::before'' and ''::after'',
 	the ''::marker'' pseudo-element can be styled with the full range of CSS properties and values,
 	exactly like a real element.
-	Markers are placed at the beginning of their superior parent's content,
+	Markers are placed at the beginning of their originating element's content,
 	before the ''::before'' pseudo-element (if it exists).
 	''::marker'' pseudo-elements are inline by default,
 	though certain values for 'list-style-position' on the list item can make the marker box positioned,