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

[Roundup Robot]

Changes by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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pull_requests: +689

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