fix "Data attributes" link in JS docs sidenav

`#js-data-attributes` => `#js-data-attrs`

docs/_includes/nav-javascript.html

@@ -2,7 +2,7 @@
   <a href="#js-overview">Overview</a>
   <ul class="nav">
     <li><a href="#js-individual-compiled">Individual or compiled</a></li>
-    <li><a href="#js-data-attributes">Data attributes</a></li>
+    <li><a href="#js-data-attrs">Data attributes</a></li>
     <li><a href="#js-programmatic-api">Programmatic API</a></li>
     <li><a href="#js-noconflict">No Conflict</a></li>
     <li><a href="#js-events">Events</a></li>