[Checkins] [zopefoundation/zope.interface] 83f4f5: Add warning to change note about string changes br...

[Jason Madden]

  Branch: refs/heads/issue170
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: 83f4f556991d6fc98eb26fcf918c657224cd05bf
      https://github.com/zopefoundation/zope.interface/commit/83f4f556991d6fc98eb26fcf918c657224cd05bf
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-02-08 (Sat, 08 Feb 2020)

  Changed paths:
    M CHANGES.rst
    M docs/README.rst
    M docs/verify.rst
    M src/zope/interface/interfaces.py
    M src/zope/interface/verify.py

  Log Message:
  -----------
  Add warning to change note about string changes breaking doctests.

Also tweak documentation to DRY for verifyObject/verifyClass.