Fix the default value for the constraints option of forms

stof · web-flow · commit ad7303f7ca0c · 2024-03-21T18:22:19.000+01:00
`null` is not a valid value of this option.
diff --git a/reference/forms/types/options/constraints.rst.inc b/reference/forms/types/options/constraints.rst.inc
@@ -1,7 +1,7 @@
 ``constraints``
 ~~~~~~~~~~~~~~~
 
-**type**: ``array`` or :class:`Symfony\\Component\\Validator\\Constraint` **default**: ``null``
+**type**: ``array`` or :class:`Symfony\\Component\\Validator\\Constraint` **default**: ``[]``
 
 Allows you to attach one or more validation constraints to a specific field.
 For more information, see :ref:`Adding Validation <form-option-constraints>`.
