watch_event is so diff from official docu

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https://github.com/googleapis/google-api-ruby-client/blob/1b34093295984eef69a63a5e788c869444d003b0/google-api-client/generated/google/apis/calendar_v3/service.rb#L1762
defined the method `def watch_event(calendar_id, channel_object = nil, always_include_email: nil`, which takes a so long arguments
However, in official docu https://developers.google.com/calendar/v3/reference/events/watch, it only takes 6 arguments

I noticed in git history, this method has not been updated for 6 years. Is it still valid?