removed setData from the Graph2d docs

docs/graph2d.html

@@ -118,7 +118,7 @@ For backwards compatibility, groups and options can be interchanged.
 
 <p>
   Data, options and groups can be set or changed later on using the functions
-  <code>Graph2d.setData(data)</code>, <code>Graph2d.setOptions(options)</code> and <code>Graph2d.setGroups(groups)</code>.
+  <code>Graph2d.setItems(data)</code>, <code>Graph2d.setOptions(options)</code> and <code>Graph2d.setGroups(groups)</code>.
 </p>
 
 <h2 id="Data_Format">Data Format</h2>