Typo

Author: javiereguiluz

form/create_custom_field_type.rst

@@ -136,7 +136,7 @@ These are the most important methods that a form type class can define:
 .. _form-type-methods-explanation:
 
 ``buildForm()``
-    It adds a configures other types into this type. It's the same method used
+    It adds and configures other types into this type. It's the same method used
     when :ref:`creating Symfony form classes <form-creating-form-classes>`.
 
 ``buildView()``