[Checkins] [zopefoundation/Zope] aba18e: Add documentation to update the Github pages.

[GitHub]

  Branch: refs/heads/2.13
  Home:   https://github.com/zopefoundation/Zope
  Commit: aba18e89b39a4efdcc12ee77efe3c35efef55a08
      https://github.com/zopefoundation/Zope/commit/aba18e89b39a4efdcc12ee77efe3c35efef55a08
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-01-27 (Sat, 27 Jan 2018)

  Changed paths:
    M doc/maintainers/RELEASING.rst

  Log Message:
  -----------
  Add documentation to update the Github pages.