Update example

Since this example was written the phantomjs home page has been redesigned and the targeted ID no longer exists. This tweaks the example so that it can again find content to report.

examples/phantomwebintro.js

@@ -10,7 +10,7 @@ page.open("http://www.phantomjs.org", function(status) {
     if ( status === "success" ) {
         page.includeJs("http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js", function() {
             page.evaluate(function() {
-                console.log("$(\"#intro\").text() -> " + $("#intro").text());
+                console.log("$(\".explanation\").text() -> " + $(".explanation").text());
             });
             phantom.exit();
         });