[reference][forms] Updating choice tag for new empty value behavior

Author: weaverryan

reference/forms/types/choice.rst

@@ -87,14 +87,16 @@ Adding an "empty value"
 
 If you're using the non-expanded version of the type (i.e. a ``select`` tag)
 element and you'd like to have a blank entry (e.g. "Choose an option") at
-the top of the select box, you can easily do so:
+the top of the select box, you can easily do so by doing the following:
 
-* Set the ``multiple`` option to false
-* Set the ``required`` option to false
+* Set the ``multiple`` option to false;
 
-With these two options, a blank choice will display at the top of the select
-box. To customize what that entry says, add the following when rendering
-the field:
+* Set the ``required`` option to false or explicitly pass in the ``empty_value``
+  option in the template (as shown below).
+
+If ``required`` is true, a blank choice will display at the top of the select
+box. To customize what that entry says (or if you have ``required`` set to
+``false``), add the following when rendering the field:
 
 .. configuration-block::