added missing crosslink

from http://symfony.com/doc/current/components/security/authorization.html#access-decision-manager to http://symfony.com/doc/current/cookbook/security/voters.html#changing-the-access-decision-strategy

added missing crosslink

adding missing crosslink from http://symfony.com/doc/current/cookbook/security/voters.html#changing-the-access-decision-strategy to http://symfony.com/doc/current/components/security/authorization.html#access-decision-manager

changed note:: to seealso::

changed note:: to seealso::

added full stop

changed to labeled link

changed link

changed link

added pointer

added pointer