[#4786] Adding a few versionadded's for the changed method name

Author: weaverryan

book/forms.rst

@@ -470,6 +470,10 @@ you'll need to specify which validation group(s) your form should use::
         'validation_groups' => array('registration'),
     ))->add(...);
 
+.. versionadded:: 2.7
+    The ``configureOptions()`` method was introduced in Symfony 2.7. Previously,
+    the method was called ``setDefaultOptions()``.
+
 If you're creating :ref:`form classes <book-form-creating-form-classes>` (a
 good practice), then you'll need to add the following to the ``configureOptions()``
 method::

cookbook/form/create_custom_field_type.rst

@@ -72,6 +72,10 @@ important:
     set) the ``multiple`` attribute on the ``select`` field. See `Creating a Template for the Field`_
     for more details.
 
+.. versionadded:: 2.7
+    The ``configureOptions()`` method was introduced in Symfony 2.7. Previously,
+    the method was called ``setDefaultOptions()``.
+
 ``configureOptions()``
     This defines options for your form type that
     can be used in ``buildForm()`` and ``buildView()``. There are a lot of