corrected the namespace

Author: holloway87

security/named_hashers.rst

@@ -116,7 +116,7 @@ be done with named hashers:
 
 This creates a hasher named ``harsh``. In order for a ``User`` instance
 to use it, the class must implement
-:class:`Symfony\\Component\\PasswordHasher\\Hasher\\PasswordHasherAwareInterface`.
+:class:`Symfony\\Component\\PasswordHasher\\PasswordHasherAwareInterface`.
 The interface requires one method - ``getPasswordHasherName()`` - which should return
 the name of the hasher to use::