[docs] [issue26964] Incorrect documentation for `-u`-flag

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


----------
nosy: +berker.peksag
stage:  -> patch review
type:  -> behavior
versions: +Python 3.5, Python 3.6, Python 3.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26964>
_______________________________________