Commandline paramters of ipc_* generators are not described well

[cpresser]

Most ipc_**.py generators have the following parameters

    parser.add_argument('files', metavar='file', type=str, nargs='+',
                        help='list of files holding information about what devices should be created.')
    parser.add_argument('--global_config', type=str, nargs='?', help='the config file defining how the footprint will look like. (KLC)', default='../tools/global_config_files/config_KLCv3.0.yaml')
    parser.add_argument('--series_config', type=str, nargs='?', help='the config file defining series parameters.', default='config_KLCv3.0.yaml')
    parser.add_argument('--ipc_definition', type=str, nargs='?', help='the ipc definition file', default='ipc7351B_smd_two_terminal.yaml')

From what I understand global and series have the same effect, but series overrides global. That should be reflected in the help text.