Minor typo fix and added link to Google Data Table

docs/dataset.html

@@ -117,8 +117,8 @@ var data = new vis.DataSet([data] [, options])
 </p>
 
 <p>
-  The parameter <code>data</code>code> is optional and can be an Array or
-  Google DataTable with items.
+  The parameter <code>data</code> is optional and can be an Array or
+  <a href="https://developers.google.com/chart/interactive/docs/reference#DataTable" target="_blank">Google DataTable</a> with items.
 </p>
 
 <p>
@@ -863,4 +863,4 @@ var positiveBalance = dataset.get({
 
 </div>
 </body>
-</html>
+</html>