XEP-0313: fix duplicate anchors

xep-0313.xml

@@ -196,10 +196,10 @@
 
 	<p>Servers that expose archive messages of sent/received messages on behalf of local users MUST expose these archives to the user on the user's bare JID.</p>
 	</section3>
-	<section3 topic='MUC archives' anchor='archives_user'>
+	<section3 topic='MUC archives' anchor='archives_muc'>
 		<p>A MUC service allowing MAM queries for a room MUST expose the MAM archive on the room's bare JID</p>
 	</section3>
-	<section3 topic='Pubsub node archives' anchor='archives_user'>
+	<section3 topic='Pubsub node archives' anchor='archives_pubsub'>
 		<p>A pubsub service allowing MAM queries for a node's data MUST expose this for queries addressed to the pubsub service</p>
 	</section3>
 	</section2>