Fix XML header on example.
+The following examples show two host-meta link records: the first indicates support for the XMPP Over BOSH connection method defined in XEP-0124 and XEP-0206 and the second indicates support for the XMPP Over WebSocket connection method defined in &rfc7395;.
As specified in RFC 6120 §3, support for the XML encoding of the host-meta resource is REQUIRED while alternative representations such as JSON are OPTIONAL.
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