What do you want to happen?

I wonder why in the cronjob example there is a condition to check if cronjob contains finalizer and if so add it. See:

		if !controllerutil.ContainsFinalizer(cronJob, myFinalizerName) {
			controllerutil.AddFinalizer(cronJob, myFinalizerName)

However ContainsFinalizer seems to be overkill as AddFinalizer function do the same check inside and it will not add the finalizer once it is already there:

func AddFinalizer(o client.Object, finalizer string) (finalizersUpdated bool) {
	f := o.GetFinalizers()
	for _, e := range f {
		if e == finalizer {
			return false
		}
	}
	o.SetFinalizers(append(f, finalizer))
	return true
}

I would like to remove ContainsFinalizer as it is not needed and update documentation. Before doing so please comment if my reasoning is fine.

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