press releases: fix stanford announcement in rss feed

lms/templates/feed.rss

@@ -11,7 +11,7 @@
     <id>tag:www.edx.org,2012:Post/17</id>
     <published>2012-12-19T14:00:00-07:00</published>
     <updated>2012-12-19T14:00:00-07:00</updated>
-    <link type="text/html" rel="alternate" href="${reverse('press_release', args=['stanford-announcement'])}"/>
+    <link type="text/html" rel="alternate" href="${reverse('press_release', args=['stanford-to-work-with-edx'])}"/>
     <title>Stanford University to Collaborate with edX on Development of Non-Profit Open Source edX Platform</title>
     <content type="html">&lt;img src=&quot;${static.url('images/press/releases/stanford-university_204x114.png')}&quot; /&gt;
         &lt;p&gt;&lt;/p&gt;</content>