Ticket 50161 - Fixed some descriptions in "dsconf backend --help"
    
    Description: - Help for "suffix" was no longer correct
                 - Help for "create" changed to "Create a backend database"
                 - Changed descriptions to start with a capital letter for consistency
    
    https://pagure.io/389-ds-base/issue/50161
    
    Reviewed by: mhonek, mreynolds