fix default value for choice_translation_domain of the EntityType

Author: xabbuh

reference/forms/types/entity.rst

@@ -258,7 +258,18 @@ These options inherit from the :doc:`ChoiceType </reference/forms/types/choice>`
 
 .. include:: /reference/forms/types/options/choice_attr.rst.inc
 
-.. include:: /reference/forms/types/options/choice_translation_domain.rst.inc
+``choice_translation_domain``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+**type**: ``string``, ``boolean`` or ``null`` **default**: ``false``
+
+This option determines if the choice values should be translated and in which
+translation domain.
+
+The values of the ``choice_translation_domain`` option can be ``true`` (reuse the current
+translation domain), ``false`` (disable translation), ``null`` (uses the parent translation
+domain or the default domain) or a string which represents the exact translation
+domain to use.
 
 .. include:: /reference/forms/types/options/expanded.rst.inc