Adds a return type of Object to the event.data property doc page

Author: brandwaffle

entries/event.data.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<entry type="property" name="event.data">
+<entry type="property" name="event.data" return="Object">
   <title>event.data</title>
   <signature>
     <added>1.1</added>
@@ -35,4 +35,4 @@ for (var i = 0; i < 5; i++) {
   </example>
   <category slug="events/event-object"/>
   <category slug="version/1.1"/>
-</entry>
+</entry>