[docs] [issue27992] Clarify %(prog)s in argparse help formatter returns basename of sys.argv[0] by default

[py.user]

py.user <bugzilla-mail-box at yandex.ru> added the comment:

@Karthikeyan Singaravelan
Thank you for the point. I added a new patch.

----------
Added file: https://bugs.python.org/file48245/argparse_sys-argv-0-basename.diff

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27992>
_______________________________________