Extend /about meta desc

sites/about/index.php

@@ -9,7 +9,7 @@
 
 	<link rel="canonical" href="<?=$SITE_CANONICAL_URL?>/about/">
 	<link rel="stylesheet" href="/css/common-dark.css">
-	<meta name="description" content="Learn more about sessioncommunities.online, the online self-updating list of Session Communities.">
+	<meta name="description" content="Learn more about sessioncommunities.online, the up-to-date list of public Session groups; learn how to get your Session Community listed or how to contact us.">
 	<title>About — sessioncommunities.online</title>
 	<meta property="og:title" content="About — sessioncommunities.online">
 	<meta property="og:description" content="Session Communities are public chatrooms accessible from within Session Messenger. <?php