bug #4639 Update by_reference.rst.inc (docteurklein)

This PR was submitted for the 2.6 branch but it was merged into the 2.3 branch instead (closes #4639).

Discussion
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Update by_reference.rst.inc

Commits
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ba881a3 Update by_reference.rst.inc

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.