fix: add-data-to-mails.md by adding content about registering event subscriber #2054
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See docs page:
https://developer.shopware.com/docs/guides/plugins/plugins/content/mail/add-data-to-mails.html#adding-data-via-subscriber
It mentions to add a class
MyMailSubscriber, which implements theEventSubscriberInterfacebut doesn't explain that it needs to be registered to the service container with the<tag name="kernel.event_subscriber"/>tag.This PR adds a section with that extra needed information.