Horizon supports multi regions

[Alessandro M. Martellone]

In http://docs.openstack.org/openstack-ops/content/scaling.html is written that Horizon supports only a single region.
More precisely, the sentence is: "The OpenStack dashboard (horizon) currently uses only a single region, so one dashboard service should be run per region."
This sentence is not correct, because we can configure Horizon so that it manages more regions through AVAILABLE_REGIONS parameter . We can refer to :
1) http://docs.openstack.org/developer/horizon/topics/settings.html
2)https://github.com/openstack/horizon/blob/d5fea888a82414e25cf49dcb779ab4f4d4a8b094/openstack_dashboard/local/local_settings.py.example

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/136169

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/136169
Committed: https://git.openstack.org/cgit/openstack/operations-guide/commit/?id=4796096aea1edaf2ffee1d1a1cbe6b1f44bbab65
Submitter: Jenkins
Branch: master

commit 4796096aea1edaf2ffee1d1a1cbe6b1f44bbab65
Author: Shilla Saebi <email address hidden>
Date: Thu Nov 20 17:59:04 2014 -0500

    made changes to ch_arch_scaling

    Horizon supports multi region so changed ch_arch_scaling
    also made some changes to sentences structure to make sense
    removed an incomplete sentence

    Change-Id: If6eb34f13131a287c317d6bdc8f1d282ddc81fab
    Closes-Bug: #1374344