Add example output for file integrity check rake task
What does this MR do?
Adds example output so you don't need to experiment or self-interpret code to know what it's going to do and look like.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
https://gitlab.com/gitlab-org/gitlab-ce/issues/49244
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Documentation created/updated - Conforms to the code review guidelines
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Has been reviewed by a Backend maintainer
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Conforms to the style guides -
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