[docs] [issue29329] Incorrect documentation for custom `hex()` support on Python 2

[Zachary Ware]

Zachary Ware added the comment:

LGTM.

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assignee: docs at python -> Mariatta
nosy: +Mariatta, zach.ware
stage: needs patch -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29329>
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