[Form] fix choice_label values

reference/forms/types/options/choice_label.rst.inc

@@ -4,7 +4,7 @@ choice_label
 .. versionadded:: 2.7
     The ``choice_label`` option was introduced in Symfony 2.7.
 
-**type**: ``callable`` or ``string`` **default**: ``null``
+**type**: ``string``, ``bool``, ``callable`` or ``PropertyPath`` **default**: ``null``
 
 Normally, the array key of each item in the ``choices`` option is used as the
 text that's shown to the user. The ``choice_label`` option allows you to take
@@ -48,3 +48,6 @@ If your choice values are objects, then ``choice_label`` can also be a
         'choices_as_values' => true,
         'choice_label' => 'displayName',
     ));
+
+If set to ``false``, all the label tags will be discarded. You can also return
+``false`` from the callable to handle each choice differently.