[Checkins] [zopefoundation/Zope] e7829a: Simplify linting configuration and lint docs, too.

[Michael Howitz]

  Branch: refs/heads/fix-linting
  Home:   https://github.com/zopefoundation/Zope
  Commit: e7829a0dc5ee406bf625c577e3681d0d8912e9ad
      https://github.com/zopefoundation/Zope/commit/e7829a0dc5ee406bf625c577e3681d0d8912e9ad
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-29 (Wed, 29 May 2019)

  Changed paths:
    M docs/zdgbook/examples/Poll.py
    M docs/zdgbook/examples/PollImplementation.py
    M docs/zdgbook/examples/PollProduct.py
    M tox.ini

  Log Message:
  -----------
  Simplify linting configuration and lint docs, too.