[docs] Python Document EPUB version problem

[黃才展]

Hello, I'm new to learning python and the tutorial on docs.python.org looks
good for beginners. I downloaded the epub format on
https://docs.python.org/3/download.html and opened with my reader on phone.
However, all my epub reader reported that the epub file was broken. I've
checked the file with online epub validator and here is the result.
[image: image.png]
Please fix the error, or the epub file cannot be used. Thanks for your time
reading this mail.

J.J. Wong
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