Fixed #21075 - Improved doc for calling call_command with arguments.

      management.call_command('flush', verbosity=0, interactive=False)

      management.call_command('loaddata', 'test_data', verbosity=0)

Note that command options that take no arguments are passed as keywords

with ``True`` or ``False``::

      management.call_command('dumpdata', use_natural_keys=True)

Command options which take multiple options are passed a list::

      management.call_command('dumpdata', exclude=['contenttypes', 'auth'])

Output redirection

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