I tried to push the fix myself, but I guess I don't have the permissions. Anyways, it should read like the following:
/* By default, the PubNub library is built to work with the Ethernet
* shield. WiFi shield support can be enabled by commenting out the
* following line and uncommenting the line after that. Refer
* to the PubNubJsonWifi sketch for a complete example. */
I tried to push the fix myself, but I guess I don't have the permissions. Anyways, it should read like the following: