Removed the mention to the deprecated delivery_address option

Author: javiereguiluz

email.rst

@@ -83,7 +83,6 @@ The following configuration attributes are available:
 
   * ``type`` (how to queue the messages, ``file`` or ``memory`` is supported, see :doc:`/email/spool`)
   * ``path`` (where to store the messages)
-* ``delivery_address`` (an email address where to send ALL emails)
 * ``delivery_addresses`` (an array of email addresses where to send ALL emails)
 * ``disable_delivery`` (set to true to disable delivery completely)