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

[Matthias v/d Meent]

Matthias v/d Meent added the comment:

Yes, they do work. It's just that the links to 3.5 are missing in the sidebar of 3.6 and 3.7. The docs are still reachable though.

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