minor #8905 Update http_foundation.rst (nalekberov)

This PR was submitted for the 4.0 branch but it was merged into the 2.7 branch instead (closes #8905).

Discussion
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Update http_foundation.rst

PHPBB 4 not released yet, PHPBB 3 would make more sense.

Commits
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3526c26 Update http_foundation.rst

Author: xabbuh

create_framework/http_foundation.rst

@@ -285,15 +285,15 @@ the wheel.
 
 I've almost forgot to talk about one added benefit: using the HttpFoundation
 component is the start of better interoperability between all frameworks and
-applications using it (like `Symfony`_, `Drupal 8`_, `phpBB 4`_, `ezPublish
+applications using it (like `Symfony`_, `Drupal 8`_, `phpBB 3`_, `ezPublish
 5`_, `Laravel`_, `Silex`_ and `more`_).
 
 .. _`Twig`: http://twig.sensiolabs.org/
 .. _`HTTP specification`: http://tools.ietf.org/wg/httpbis/
 .. _`audited`: https://symfony.com/blog/symfony2-security-audit
 .. _`Symfony`: https://symfony.com/
 .. _`Drupal 8`: https://drupal.org/
-.. _`phpBB 4`: https://www.phpbb.com/
+.. _`phpBB 3`: https://www.phpbb.com/
 .. _`ezPublish 5`: http://ez.no/
 .. _`Laravel`: http://laravel.com/
 .. _`Silex`: http://silex.sensiolabs.org/