minor #7595 Update exception code status (matthieu88160, javiereguiluz)

This PR was submitted for the 3.2 branch but it was merged into the 2.7 branch instead (closes #7595).

Discussion
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Update exception code status

Related to issue #7594 , propose update for exception code status to follow the status code semantic.

Commits
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2e5ca2e Add the description for the HTTP status because it's not that common
e08b57b Update exception code status

Author: xabbuh

security/custom_password_authenticator.rst

@@ -57,7 +57,7 @@ the user::
                 if ($currentHour < 14 || $currentHour > 16) {
                     throw new AuthenticationException(
                         'You can only log in between 2 and 4!',
-                        100
+                        412 // HTTP 412 Precondition Failed
                     );
                 }