[docs] small doc typo

[Berker Peksağ]

On Tue, Mar 28, 2017 at 3:47 AM, Sean Canavan <seantcanavan at gmail.com> wrote:
> Under
> https://docs.python.org/2/howto/argparse.html#introducing-optional-arguments
>
> "So far we, have been playing with positional arguments" should probably be
> "So far we have been playing with positional arguments"

Hi Sean,

Thanks for the report. I've opened
https://github.com/python/cpython/pull/1141 to fix this.

--Berker