Added missing quote for `UnexpectedTypeException `

src/Symfony/Component/Form/Exception/UnexpectedTypeException.php

@@ -15,6 +15,6 @@ class UnexpectedTypeException extends FormException
 {
     public function __construct($value, $expectedType)
     {
-        parent::__construct(sprintf('Expected argument of type %s, %s given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
+        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
     }
 }