minor #10532 Corrected variable name to $security (Laurent3170)

This PR was merged into the 4.1 branch.

Discussion
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Corrected variable name to $security

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Commits
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8d877ca Corrected variable name to $security

Author: javiereguiluz

security/voters.rst

@@ -220,7 +220,7 @@ with ``ROLE_SUPER_ADMIN``::
     {
         // ...
 
-        private $decisionManager;
+        private $security;
 
         public function __construct(Security $security)
         {