[docs] [issue27846] Base64 expansion factor is 4 to 3, not 6 to 4

[Zackery Spytz]

Change by Zackery Spytz <Osmunda46 at gmail.com>:


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nosy: +ZackerySpytz
versions: +Python 3.7, Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27846>
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