9cc3029 tests: correct a doc string

Authored and Committed by adamwill a year ago
    tests: correct a doc string
    
    I don't know why this was wrong, but it was. The data used in
    the mock is from a Fedora 25 Branched nightly, not a Rawhide
    compose.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>
    
        
file modified
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