minor #14166 Update security.rst (94noni)

This PR was merged into the 4.4 branch.

Discussion
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Update security.rst

Found when doing #14165

Commits
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7aaf937 Update security.rst

Author: javiereguiluz

reference/configuration/security.rst

@@ -162,7 +162,7 @@ encoding algorithm. Also, each algorithm defines different config options:
                     threads:      4     # Number of parallel threads
 
                 # MessageDigestPasswordEncoder encoder using SHA512 hashing with default options
-                AppBundle\Entity\User: 'sha512'
+                App\Entity\User: 'sha512'
 
     .. code-block:: xml