Fixed wrong references

Author: javiereguiluz

form/create_custom_field_type.rst

@@ -4,7 +4,7 @@
 How to Create a Custom Form Field Type
 ======================================
 
-Symfony comes with :doc:`tens of form types </reference/form/types>` (called
+Symfony comes with :doc:`tens of form types </reference/forms/types>` (called
 "form fields" in other projects) ready to use in your applications. However,
 it's common to create custom form types to solve specific purposes in your
 projects.
@@ -13,9 +13,9 @@ Creating Form Types Based on Symfony Built-in Types
 ---------------------------------------------------
 
 The easiest way to create a form type is to base it on one of the
-:doc:`existing form types </reference/form/types>`. Imagine that your project
+:doc:`existing form types </reference/forms/types>`. Imagine that your project
 displays a list of "shipping options" as a ``<select>`` HTML element. This can
-be implemented with a :doc:`ChoiceType </reference/form/types/choice>` where the
+be implemented with a :doc:`ChoiceType </reference/forms/types/choice>` where the
 ``choices`` option is set to the list of available shipping options.
 
 However, if you use the same form type in several forms, repeating the list of
@@ -102,7 +102,7 @@ Creating Form Types Created From Scratch
 ----------------------------------------
 
 Some form types are so specific to your projects that they cannot be based on
-any :doc:`existing form types </reference/form/types>` because they are too
+any :doc:`existing form types </reference/forms/types>` because they are too
 different. Consider an application that wants to reuse in different forms the
 following set of fields as the "postal address":