[docs] [issue36599] doctest document says dict order is unstable

[Inada Naoki]

Change by Inada Naoki <songofacandy at gmail.com>:


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title: weakref document says dict order is unstable -> doctest document says dict order is unstable

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36599>
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