[FIX] Flatdoc load specific md for web socket api

rippled-apis.html

@@ -54,7 +54,9 @@ mixpanel.init("132d42885e094171f34467fc54da6fab");
   <!-- syntax selection js -->
   <script src='js/multicodetab.js'></script>
   <script>
-    $(document).on('flatdoc:ready', $().multicode_tabs);
+    Flatdoc.run({
+      fetcher: Flatdoc.file('websocket_api.md')
+    });
   </script>
   <!-- Temporary shims until I modify the css directly -->
   <link type='text/css' rel='stylesheet' href='css/mod.css' />