fixed typo

Author: ikwattro

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

@@ -6,7 +6,7 @@ data
 When you create a form, each field initially displays the value of the 
 corresponding property of the form's domain object (if an object is bound
 to the form). If you want to override the initial value for the form or just
-and individual field, you can set it in the data option::
+an individual field, you can set it in the data option::
 
  $builder->add('token', 'hidden', array(
  'data' => 'abcdef',