Update by_reference.rst.inc

Author: docteurklein

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

@@ -42,4 +42,4 @@ call the setter on the parent object.
 Similarly, if you're using the :doc:`collection</reference/forms/types/collection>`
 form type where your underlying collection data is an object (like with Doctrine's
 ``ArrayCollection``), then ``by_reference`` must be set to ``false`` if you
-need the setter (e.g. ``setAuthors()``) to be called.
+need the adder and remover (e.g. ``addAuthor()`` and ``removeAuthor()``) to be called.