[docs] [issue28900] update 'docs for other versions'

[Roundup Robot]

Roundup Robot added the comment:

New changeset 257a1c7f9507 by Ned Deily in branch '3.6':
Issue #28900: Update documentation sidebar for 3.6.0rc.
https://hg.python.org/cpython/rev/257a1c7f9507

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<http://bugs.python.org/issue28900>
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