merged branch jdreesen/typo-fix-1 (PR #2647)

Commits
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67d91f0 fixed typo in exception message

Discussion
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Fixed typo in exception message

Fixed a small typo in the exception message which was added in d67fbe9e

src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php

@@ -111,7 +111,7 @@ class MimeTypeGuesser implements MimeTypeGuesserInterface
         }
 
         if (!$this->guessers) {
-            throw new \LogicException('Unable to guess the mime type as no guesser are available.');
+            throw new \LogicException('Unable to guess the mime type as no guessers are available.');
         }
 
         foreach ($this->guessers as $guesser) {