minor #5810 Fixed a typo (javiereguiluz)

This PR was merged into the 2.3 branch.

Discussion
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Fixed a typo

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

Commits
-------

a216b87 Fixed a typo

Author: xabbuh

cookbook/security/voters.rst

@@ -25,7 +25,7 @@ security context (i.e. the ``security.context`` service). Each one decides
 if the current user should have access to some resource.
 
 Ultimately, Symfony takes the responses from all voters and makes the final
-decission (to allow or deny access to the resource) according to the strategy defined
+decision (to allow or deny access to the resource) according to the strategy defined
 in the application, which can be: affirmative, consensus or unanimous.
 
 For more information take a look at
@@ -207,7 +207,7 @@ and tag it with ``security.voter``:
 
         // app/config/services.php
         use Symfony\Component\DependencyInjection\Definition;
-        
+
         $definition = new Definition('AppBundle\Security\Authorization\Voter\PostVoter');
         $definition
             ->setPublic(false)