minor #10580 fix RoleVoter behaviour description (xabbuh)

This PR was merged into the 2.8 branch.

Discussion
----------

fix RoleVoter behaviour description

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/roadmap for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `master` for features of unreleased versions).

-->

Commits
-------

f71cf80 fix RoleVoter behaviour description

Author: javiereguiluz

reference/twig_reference.rst

@@ -309,9 +309,8 @@ is_granted
     **type**: ``string``
 
 Returns ``true`` if the current user has the given role. If several roles are
-passed in an array, returns ``true`` if the user has all of them or at least one
-of them, depending on the value of this option:
-:ref:`security.access_decision_manager.strategy <security-voters-change-strategy>`.
+passed in an array, ``true`` is returned if the user has at least one of
+them.
 
 Optionally, an object can be passed to be used by the voter. More information
 can be found in :ref:`security-template`.