[Horizon] Fixed help_url to point to upstream docs
[Horizon] Fixed help_url to point to upstream docs

Change-Id: I213d61d2d6eaf5287a7a3f1a58d70b827dfcbebf
Fixes: rhbz#1080917

openstack/packstack,openstack/packstack,imcsk8/packstack,xbezdick/packstack,mahak/packstack,stackforge/packstack,palmer159/openstack-test,fr34k8/packstack,xbezdick/packstack,fr34k8/packstack,palmer159/openstack-test,openstack/packstack,imcsk8/packstack,stackforge/packstack,fr34k8/packstack,palmer159/openstack-test,stackforge/packstack,mahak/packstack,xbezdick/packstack,mahak/packstack,imcsk8/packstack