Update form_events.rst

[redstar504]

EventSubscriberInterface::getSubscribedEvents() method is static.

[xabbuh]

👍

[stof]

👍

[redstar504]

Also, why is this subscriber class called AddEmailFieldListener? Shouldn't it be AddEmailFieldSubscriber?

[wouterj]

@redstar504 Symfony Core calls everything listeners (in fact, a subscriber is nothing more than a group of listener functions), we just follow that convention in the docs.

[weaverryan]

You're on a roll - thanks @redstar504 for all the fixes!