[docs] [issue17332] typo in json docs - "convered" should be "converted"

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


----------
keywords: +easy
stage:  -> needs patch
versions:  -Python 2.6, Python 3.1, Python 3.5

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17332>
_______________________________________