[docs] [issue27644] Expand documentation about type aliases and NewType in the typing module

[Guido van Rossum]

Guido van Rossum added the comment:

Thanks! Should go live later today.

----------
resolution:  -> fixed
status: open -> closed

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27644>
_______________________________________