Fixed a plural issue

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Author: BenjaminPaap

book/translation.rst

@@ -321,7 +321,7 @@ The translator service is accessible in PHP templates through the
     <?php echo $view['translator']->trans('Symfony2 is great') ?>
 
     <?php echo $view['translator']->transChoice(
-        '{0} There is no apples|{1} There is one apple|]1,Inf[ There are %count% apples',
+        '{0} There are no apples|{1} There is one apple|]1,Inf[ There are %count% apples',
         10,
         array('%count%' => 10)
     ) ?>