[docs] [issue26355] Emit major version based canonical URLs for docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset c63b09833141 by Nick Coghlan in branch '3.5':
Issue #26355: Specify canonical URLs in docs pages
https://hg.python.org/cpython/rev/c63b09833141

New changeset 80970cf56048 by Nick Coghlan in branch '3.6':
Merge issue #26355 fix from Python 3.5
https://hg.python.org/cpython/rev/80970cf56048

New changeset 26af402c291f by Nick Coghlan in branch 'default':
Merge issue #26355 fix from 3.6
https://hg.python.org/cpython/rev/26af402c291f

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nosy: +python-dev

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