`event_eventsub_notification_ban` is not documented

[frzyc]

Trying to register for an ban/unban bot feature,
I was able to use the subscribe_channel_bans function to register for the EventSub.
However, there is no corresponding "ban" event notification sub function described in the documentation.
Took several tries before stumbling upon the event_eventsub_notification_ban function.
It would be great if this function would be documented in the docs.

[github-actions]

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