minor symfony#18509 [Form] Remove the deprecated renderForm() shortcut (javiereguiluz)

This PR was merged into the 7.0 branch.

Discussion
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[Form] Remove the deprecated renderForm() shortcut

Related to symfony#18507.

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bf08b82 [Form] Remove the deprecated renderForm() shortcut

Author: OskarStark

forms.rst

@@ -282,13 +282,6 @@ Now that the form has been created, the next step is to render it::
 Internally, the ``render()`` method calls ``$form->createView()`` to
 transform the form into a *form view* instance.
 
-.. deprecated:: 6.2
-
-    Prior to Symfony 6.2, you had to use ``$this->render(..., ['form' => $form->createView()])``
-    or the ``renderForm()`` method to render the form. The ``renderForm()``
-    method is deprecated in favor of directly passing the ``FormInterface``
-    instance to ``render()``.
-
 Then, use some :ref:`form helper functions <reference-form-twig-functions>` to
 render the form contents: