[docs] [issue9730] base64 docs refers to strings instead of bytes

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I reviewed the doc and tightened up the wording (which was already mostly correct) in r85672.  Also fixed one typo and changed it to consistently use 'byte string' (rather than 'bytestring' which was used in one or two places).

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