[issue17218] support title and description in argparse add_mutually_exclusive_group

[Tatiana Al-Chueyr]

Changes by Tatiana Al-Chueyr <tatiana.alchueyr at gmail.com>:


Removed file: http://bugs.python.org/file34844/test_argparse_mutex_with_title.py

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<http://bugs.python.org/issue17218>
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