[css-lists-3] Remove unnecessary list-item counter-reset/increment declarations from example.

Author: fantasai

css-lists-3/Overview.bs

@@ -1174,8 +1174,6 @@ Outputting Counters: the ''counter()'' and ''counters()'' functions</h3>
 				&lt;li>three&lt;/li>
 			&lt;/ul>
 			&lt;style>
-			ul { counter-reset: list-item; }
-			li { counter-increment: list-item; }
 			li::marker { content: '(' counters(list-item,'.') ') '; }
 			&lt;/style>
 		</pre>