[Form] Added a missing use statement and fix a phpdoc

src/Symfony/Component/Form/Extension/Core/DataTransformer/BaseDateTimeTransformer.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Form\Extension\Core\DataTransformer;
 
 use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
 
 abstract class BaseDateTimeTransformer implements DataTransformerInterface
 {

src/Symfony/Component/Form/Form.php

@@ -76,7 +76,7 @@ class Form implements \IteratorAggregate, FormInterface
 
     /**
      * The mapper for mapping data to children and back
-     * @var DataMapper\DataMapperInterface
+     * @var DataMapperInterface
      */
     private $dataMapper;