Comment 2 for bug 1622035

Reviewed: https://review.openstack.org/368249
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=bf5711ef029e230fb8d9daae34f0528c8b68a9ae
Submitter: Jenkins
Branch: master

commit bf5711ef029e230fb8d9daae34f0528c8b68a9ae
Author: Eric Brown <email address hidden>
Date: Fri Sep 9 15:45:52 2016 -0700

    Remove the dead link in schema migration doc

    The schema migration document refers to a another document that
    doesn't exist. This patch removes the reference since no appropriate
    link could be found.

    The doc was also updated to include the copyright.

    This fix also resolves a warning in the tox doc build:

    /keystone/doc/source/online_schema_migration_examples.rst:23:
    WARNING: undefined label: online-migration (if the link has no
    caption the label must precede a section header)

    Change-Id: I4732651f8c5efd9fa494fd5fba5dad1f782d89a2
    Closes-Bug: #1622035