[docs] [issue33147] Update references for RFC 3548 to RFC 4648

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Ewa handles recording of CAs.

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assignee:  -> docs at python
components: +Documentation
nosy: +Ewa.Jodlowska, docs at python, terry.reedy
stage:  -> patch review
versions: +Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33147>
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