Advertise support and fix typo:
+Any entity that is allowed to publish items to a node (i.e., a publisher or an owner) may do so at any time by sending an IQ-set to the service containing a pubsub element with a <publish/> child.
+A pubsub service MAY support the ability to publish items (if so, it MUST advertise support for the "http://jabber.org/protocol/pubsub#publish" feature). Any entity that is allowed to publish items to a node (i.e., a publisher or an owner) may do so at any time by sending an IQ-set to the service containing a pubsub element with a <publish/> child.
The syntax is as follows: