Recommend /assets directory

Author: jmsche

bundles/best_practices.rst

@@ -568,7 +568,7 @@ Assets location
 Your assets must be located in one of the following directories, with a ``package.json`` file so Flex can handle it
 during install/update:
 
-* ``/assets``
+* ``/assets`` (recommended)
 * ``/Resources/assets``
 * ``/src/Resources/assets``