patch github link in torchtune docs header

Author: ebsmothers

docs/source/_templates/layout.html

@@ -15,7 +15,13 @@
     var collapsedSections = ['Introduction', 'Getting Started', 'Tutorials']
 </script> -->
 
-<script script type="text/javascript">
+<script type="text/javascript">
     var collapsedSections = []
-</script>
+    </script>
+    {{ super() }}
+    <script type="text/javascript">
+      $(document).ready(function() {
+            $(".main-menu-item a[href='https://github.com/pytorch/pytorch']").attr("href", "https://github.com/pytorch/torchtune");
+      });
+    </script>
 {% endblock %}