minor #15954 [Security] Update security.rst (abdounikarim)

This PR was merged into the 5.3 branch.

Discussion
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[Security] Update security.rst

Hello, I updated the docs to use the `hashPassword` method from the `Symfony\Component\PasswordHasher\Hasher\UserPasswordHasherInterface` class.

Commits
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f1c375c Update security.rst

Author: javiereguiluz

security.rst

@@ -473,7 +473,7 @@ the database::
             $plaintextPassword = ...;
 
             // hash the password (based on the security.yaml config for the $user class)
-            $hashedPassword = $passwordHasher->hash(
+            $hashedPassword = $passwordHasher->hashPassword(
                 $user,
                 $plaintextPassword
             );