Minor reword

Author: javiereguiluz

form/create_custom_field_type.rst

@@ -230,8 +230,10 @@ Adding Configuration Options for the Form Type
 Imagine that your project requires to make the ``PostalAddressType`` to be
 configurable in two ways:
 
-* Addresses should be allowed to display three "address lines" instead of two;
-* Addresses should be able to restrict the possible states to a given list.
+* In addition to "address line 1" and "address line 2", some addresses should be
+  allowed to display an "address line 3" to store extended address information;
+* Instead of displaying a free input text, some addresses should be able to
+  restrict the possible states to a given list.
 
 Form type options are defined in the ``configureOptions()`` method. Read the
 :doc:`OptionsResolver component documentation </components/options_resolver>` to