Improve documentation of import/export rake task

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Hello,

We are currently migrating some projects from one Gitlab to another. I've basically using the web ui for this, but unfortunately importing large projects is not really good working (importer could need some improvement, but different story).

So I thought there would be a command line utility for this.

On the import/export documentation is a rake task referenced: https://gitlab.com/help/administration/raketasks/project_import_export.md

But from the documentation of the rake task, I really don't know how to use it or if it even is in any use for me. So this should be improved (for less advanced rake users):

• In one sentence: describe what this task is for
• Show example on how single projects can be imported/exported