[FIX] add multicode JS

ripple-rest.html

@@ -58,6 +58,9 @@ mixpanel.init("132d42885e094171f34467fc54da6fab");
   
   <!-- syntax selection js -->
   <script src='js/multicodetab.js'></script>
+  <script>
+    $(document).on('flatdoc:ready', $().multicode_tabs);
+  </script>
   <script>
     Flatdoc.run({
       fetcher: Flatdoc.file('ripplerest_api.md')