[Form] Explain why data events aren't dispatched in forms with the inherit_data option turned on. #21739
Description
Original issue: symfony/symfony#63131
Related code: https://github.com/symfony/symfony/blob/5f967ccc409ea0849eddb3942e0be2f036249e8c/src/Symfony/Component/Form/Form.php#L253
Doc: https://symfony.com/doc/current/reference/forms/types/form.html#inherit-data
Explanation: symfony/symfony#63131 (comment)