[css-ui-4][editorial] Mention the property name in the heading

Author: tabatkins

css-ui-4/Overview.bs

@@ -2094,7 +2094,7 @@ In these instances, the <{input/disabled}> attribute is probably more appropriat
 
 
 <h3 id="interest">
-User Interest Delay</h3>
+User Interest Delay: the 'interest-delay-*' properties</h3>
 
 	<pre class="propdef">
 	Name: interest-delay-start, interest-delay-end