[docs] Epub Broken

[John Halbert]

I downloaded your latest docs in epub format and received an error when
being processed by my Google books app.  I checked http://validator.idpf.org
and received several validation errors regarding missing references.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/docs/attachments/20180211/fda2f986/attachment-0001.html>