[Validator] clarify stringable type annotations

src/Symfony/Component/Validator/ConstraintViolation.php

@@ -32,7 +32,7 @@ class ConstraintViolation implements ConstraintViolationInterface
     /**
      * Creates a new constraint violation.
      *
-     * @param string          $message         The violation message
+     * @param string|\Stringable $message         The violation message as a string or a stringable object
      * @param string             $messageTemplate The raw violation message
      * @param array              $parameters      The parameters to substitute in the
      *                                            raw violation message

src/Symfony/Component/Validator/ConstraintViolationInterface.php

@@ -36,7 +36,7 @@ interface ConstraintViolationInterface
     /**
      * Returns the violation message.
      *
-     * @return string The violation message
+     * @return string|\Stringable The violation message as a string or a stringable object
      */
     public function getMessage();
 

src/Symfony/Component/Validator/Context/ExecutionContextInterface.php

@@ -64,7 +64,7 @@ interface ExecutionContextInterface
     /**
      * Adds a violation at the current node of the validation graph.
      *
-     * @param string $message The error message
+     * @param string|\Stringable $message The error message as a string or a stringable object
      * @param array              $params  The parameters substituted in the error message
      */
     public function addViolation($message, array $params = []);
@@ -81,7 +81,7 @@ interface ExecutionContextInterface
      *         ->setTranslationDomain('number_validation')
      *         ->addViolation();
      *
-     * @param string $message    The error message
+     * @param string|\Stringable $message    The error message as a string or a stringable object
      * @param array              $parameters The parameters substituted in the error message
      *
      * @return ConstraintViolationBuilderInterface The violation builder