[css-lists-3] Remove CSS2 synchronization warning, should be all fixed now. ^_^

Author: fantasai

css-lists-3/Overview.bs

@@ -673,10 +673,6 @@ Automatic Numbering With Counters</h2>
 	would push the value outside of that range,
 	the value must be clamped to that range.
 
-	ISSUE: This section is not fully synchronized with CSS2.
-	Please reference <a href="https://www.w3.org/TR/CSS2/generate.html#counters">Automatic Counters and Numbering in CSS Level 2</a>:
-	any conflicts or omissions here should be resolved in favor of the behavior specified in CSS2.
-
 <h3 id='counter-reset'>
 Creating Counters: the 'counter-reset' property</h3>