[docs] [issue29886] links between binascii.{un, }hexlify / bytes.{, to}hex

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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pull_requests: +10570, 10571, 10572

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29886>
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