[docs] [issue26875] mmap doc gives wrong code example

[Zachary Ware]

Zachary Ware added the comment:

Thanks for the report and patch!

----------
nosy: +zach.ware
versions: +Python 3.5, Python 3.6

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26875>
_______________________________________