Adjust variable name

Adjust variable name to be like the definition in VoterInterface

Author: sfmok

components/security/authorization.rst

@@ -87,7 +87,7 @@ of :class:`Symfony\\Component\\Security\\Core\\Authorization\\Voter\\VoterInterf
 which means they have to implement a few methods which allows the decision
 manager to use them:
 
-``vote(TokenInterface $token, $object, array $attributes)``
+``vote(TokenInterface $token, $subject, array $attributes)``
     this method will do the actual voting and return a value equal to one
     of the class constants of :class:`Symfony\\Component\\Security\\Core\\Authorization\\Voter\\VoterInterface`,
     i.e. ``VoterInterface::ACCESS_GRANTED``, ``VoterInterface::ACCESS_DENIED``