[docs] invalid link to ZIP format documnetation

[paly90 at centrum.sk]

Hi,
I'd like to report the invalid link <https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT> to ZIP format documentation used in zipfile module <https://docs.python.org/3/library/zipfile.html> doc.
 
 
  Paul

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