[docs] [issue35831] Format Spec example says limited to 3.1+ but works in 2.7

[Mitchell L Model]

Change by Mitchell L Model <mlm at users.sourceforge.net>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35831>
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