Allow options on canvas element

docs/javascript.html

@@ -140,6 +140,9 @@ $('.navmenu').offcanvas()
 {% endhighlight %}
 
     <h3>Options</h3>
+
+    <p>Options can be placed both on control and on target menu element.</p>
+
     <table class="table table-bordered table-striped">
       <thead>
         <tr>