[docs] [issue14893] Tutorial: Add function annotation example to function tutorial

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

LGTM, will commit.

----------
assignee: docs at python -> eric.araujo

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14893>
_______________________________________