[Checkins] [zopefoundation/Zope] ff667b: - explain the new class variable in the ZMI migrat...

[Jens Vagelpohl]

  Branch: refs/heads/issue_535
  Home:   https://github.com/zopefoundation/Zope
  Commit: ff667b21a64e41d656721f72200ad130eb849edb
      https://github.com/zopefoundation/Zope/commit/ff667b21a64e41d656721f72200ad130eb849edb
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-04-06 (Sat, 06 Apr 2019)

  Changed paths:
    M docs/zope4/migration/zmi.rst

  Log Message:
  -----------
  - explain the new class variable in the ZMI migration document