[docs] Improvement on argparse documentation

[Vincenzo Pii]

In the "short options" paragraph (
http://docs.python.org/2/howto/argparse.html#short-options), please specify
that when only the short option is provided for one argument, the value of
the option can be accessed by using the name of the short option without
the '-' character.

Example:

parser.add_argument("-b", help="builds the application",
action="store_true")

if (args.b == True):

Thanks,
Vincenzo.
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