Readd the versionadded directive

Author: javiereguiluz

reference/forms/types/enum.rst

@@ -4,6 +4,10 @@
 EnumType Field
 ==============
 
+.. versionadded:: 5.4
+
+   The ``EnumType`` form field was introduced in Symfony 5.4.
+
 A multi-purpose field used to allow the user to "choose" one or more options
 defined in a `PHP enumeration`_. It extends the :doc:`ChoiceType </refernce/forms/types/enum>`
 field and defines the same options.