[docs] [issue20837] Ambiguity words in base64 documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset e8cbebb273c6 by Martin Panter in branch '2.7':
Issue #20837: Base-64 alphabet clarification from revision 1853679c6f71
https://hg.python.org/cpython/rev/e8cbebb273c6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20837>
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