[docs] [issue1753718] base64 "legacy" functions violate RFC 3548

[Martin Panter]

Martin Panter added the comment:

I was waiting for you to finish here to avoid any new merge conflicts. Now that you have committed your patch, I will try and work on mine in the next few days, and I am happy to update the doc strings at the same time.

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<http://bugs.python.org/issue1753718>
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