Docs: Keep-around orphaned references rake task not providing enough guidance

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Problem to solve

We provide the a rake task to check if there are Keep-around orphaned references.

But as seen on some tickets (at least this one: internal link) the documentation doesn't tell:

Is there any expected number here? Is having 5, 1000 or 2M acceptable?
What shall be done with the output?
What's the impact of having too many?
I suspect we need to run Reduce repository size with the list from the rake task, but having confirmation would be helpful.

I think having more context about when to run this command, what do to with the output and how to fix this would be helpful to our customers.