minor #8644 Removed an uneeded deprecation notice (javiereguiluz)

This PR was squashed before being merged into the 3.3 branch (closes #8644).

Discussion
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Removed an uneeded deprecation notice

Spotted while working on #8643.

Commits
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a96a633 Removed an uneeded deprecation notice

Author: xabbuh

reference/configuration/twig.rst

@@ -55,7 +55,6 @@ TwigBundle Configuration ("twig")
             paths:
                 '%kernel.project_dir%/vendor/acme/foo-bar/templates': foo_bar
 
-            # The following were added in Symfony 2.7.
             date:
                 format: d.m.Y, H:i:s
                 interval_format: '%%d days'