Fixes for PR

Author: arthurvr

entries/unload.xml

@@ -31,8 +31,7 @@ $( window ).unload(function() {
   return "Handler for .unload() called.";
 });
     </code></pre>
-    <p>After this code executes, the alert will be displayed whenever the browser leaves the current page.
-It is not possible to cancel the <code>unload</code> event with <code>.preventDefault()</code>. This event is available so that scripts can perform cleanup when the user leaves the page.
+    <p>This event is available so that scripts can perform cleanup when the user leaves the page. Most browsers will ignore calls to <code>alert()</code>, <code>confirm()</code> and <code>prompt()</code> inside the event handler. The string you return may be used in a confirmation dialog, but not all browsers support this. It is not possible to cancel the <code>unload</code> event with <code>.preventDefault()</code>.
     </p>
   </longdesc>
   <example>