merged branch ondrowan/patch-2 (PR #2689)

Commits
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1dcf74a Fixed small typo in phpdoc.

Discussion
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Small typo in phpdoc

Awkward, but I couldn't resist...

src/Symfony/Component/Security/Core/Authorization/Voter/VoterInterface.php

@@ -45,7 +45,7 @@ interface VoterInterface
     /**
      * Returns the vote for the given parameters.
      *
-     * This method must return one of the following constant:
+     * This method must return one of the following constants:
      * ACCESS_GRANTED, ACCESS_DENIED, or ACCESS_ABSTAIN.
      *
      * @param TokenInterface $token      A TokenInterface instance