url_ads: Fix comment in inc/config.php

inc/config.php

@@ -337,11 +337,9 @@
 	$config['auto_unicode'] = true;
 	// Whether to turn URLs into functional links
 	$config['markup_urls'] = true;
-	$config['url_ads'] = ''; 
-	// Use it if you want to add something before URL 
-	//for example hide referrer 'http://www.nullrefer.com/?'  'http://anonym.to/?' 
-	//or add some sort of ads
-	
+	// Prefix those functional links with some other url, for example some service for hiding referers
+	// (eg. 'http://www.nullrefer.com/?', or 'http://anonym.to/?'), a pay-per-view exit page, etc.
+	$config['url_ads'] = '';	
 	
 	// Wordfilters are used to automatically replace certain words/phrases with something else.
 	// For a normal string replacement: