[css-lists-3] Update Changes section

Author: fantasai

css-lists-3/Overview.bs

@@ -1395,12 +1395,22 @@ This section documents the changes since previous publications.
 
 <h3 id="changes-20140320">Changes since the 20 March 2014 WD</h3>
 
-Use <<custom-ident>> consistently for counter names.
+	<ul>
+		<li>Use <<custom-ident>> consistently for counter names.
+		<li>Dropped ''position: marker'' (marker positioning is now mostly undefined, as in CSS2).
+		<li>Completely rewrote chapter on markers to tighten it up,
+		    align with current expectations, and make editorial improvements.
+		<li>Pulled the ''counter-increment/list-item'' counter definition
+		    into its own section, added examples, and made some clarifications.
+		<li>Renamed values of 'marker-side' to match conventions from box/text alignment.
+		<li>Defined that 'counter-set' is applied after 'counter-increment'
+		    rather than before. (<a href='https://github.com/w3c/csswg-drafts/issues/3810'>Issue 3810</a>)
+	</ul>
 
 <h3 id="changes-from-css2">Changes From CSS Level 2</h3>
 
-	<p>As described in the introduction section, there are significant changes in this module when
-	compared to CSS2.1.
+	<p>As described in the introduction section,
+	there are significant changes in this module when compared to CSS2.1.
 
 	<ol>
 		<li>The ''::marker'' pseudo-element has been introduced to allow styling of the list marker directly.