feat(properties): style subheading

Author: julie-ng

tmpl/method.tmpl

@@ -13,7 +13,7 @@ var self = this;
         if (properties && properties.length && properties.forEach) {
     ?>
 
-        <h5>Properties:</h5>
+        <h3 class="subtitle">Properties</h3>
         <?js= this.partial('properties.tmpl', data) ?>
 
     <?js } ?>