Correct event types

Move this to 2.0.x branch when made available.

Removed the bit about stripe.webhooks from the issue summary. I see now how that is prepended via:

$this->eventDispatcher->dispatch('stripe.webhooks.' . $notification->type, $event);

Decided to capture each item into their own issues:

• 🐛 Fix in-code links to event types documentation Active
• 🐛 Remove src/Event/BitcoinEvent.php Active
• ✨ Add Payment Intent support Active
• ✨ Add Application Fee support Active

Marking this as Closed (outdated).