[docs] [issue17714] str.encode('base64') add trailing new line character. It is not documented.

[Roundup Robot]

Roundup Robot added the comment:

New changeset cbb23e40e0d7 by Ezio Melotti in branch '3.3':
#17714: document that the base64 codec adds a trailing newline.
http://hg.python.org/cpython/rev/cbb23e40e0d7

New changeset b3e1be1493a5 by Ezio Melotti in branch 'default':
#17714: merge with 3.3.
http://hg.python.org/cpython/rev/b3e1be1493a5

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<http://bugs.python.org/issue17714>
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