minor #21741 Fix typo invalid exception type (qdequippe)

This PR was submitted for the 8.0 branch but it was squashed and merged into the 6.4 branch instead.

Discussion
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 Fix typo invalid exception type

Commits
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4fb631e00  Fix typo invalid exception type

validation/custom_constraint.rst

@@ -463,6 +463,7 @@ Now, the constraint validator will get an object as the first argument to
 
     use Symfony\Component\Validator\Constraint;
     use Symfony\Component\Validator\ConstraintValidator;
+    use Symfony\Component\Validator\Exception\UnexpectedTypeException;
     use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
     class ConfirmedPaymentReceiptValidator extends ConstraintValidator
@@ -477,7 +478,7 @@ Now, the constraint validator will get an object as the first argument to
             }
 
             if (!$constraint instanceof ConfirmedPaymentReceipt) {
-                throw new UnexpectedValueException($constraint, ConfirmedPaymentReceipt::class);
+                throw new UnexpectedTypeException($constraint, ConfirmedPaymentReceipt::class);
             }
 
             $receiptEmail = $receipt->getPayload()['email'] ?? null;