Fixed an internal link

Author: javiereguiluz

cookbook/form/data_transformers.rst

@@ -19,7 +19,7 @@ This is where Data Transformers come into play.
 
 .. caution::
 
-    When a field has the :doc:`inherit_data </reference/forms/types/options/inherit_data.rst.inc>`
+    When a field has the :doc:`inherit_data </reference/forms/types/options/inherit_data>`
     option set, Data Transformers won't be applied to that field.
 
 Creating the Transformer