Merge pull request w3c#204 from liamcurry/patch-1

Added a missing comma in the API example.

index.htm

@@ -80,7 +80,7 @@
 
 <pre><code class='javascript'>data_graphic({
     title: "Downloads",
-    description: "This graphic shows a time-series of downloads."
+    description: "This graphic shows a time-series of downloads.",
     data: [{'date':new Date('2014-11-01'),'value':12},
            {'date':new Date('2014-11-02'),'value':18}],
     width: 600,