Fixed non-existent reference

Author: javiereguiluz

reference/map.rst.inc

@@ -8,7 +8,6 @@
   * :doc:`framework </reference/configuration/framework>`
   * :doc:`doctrine </reference/configuration/doctrine>`
   * :doc:`security </reference/configuration/security>`
-  * :doc:`assetic </reference/configuration/assetic>`
   * :doc:`swiftmailer </reference/configuration/swiftmailer>`
   * :doc:`twig </reference/configuration/twig>`
   * :doc:`monolog </reference/configuration/monolog>`