[docs] [issue26696] Document collections.abc.ByteString

[Xiang Zhang]

Xiang Zhang added the comment:

Add collections.abc.ByteString's document.

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keywords: +patch
Added file: http://bugs.python.org/file42711/ByteString_doc.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26696>
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