Fix auto_scaling_enabled default in docs
Fix auto_scaling_enabled default in docs

The default for auto_scaling_enabled in kubernetes is set to false in
the cluster heat templates, but true in the end user docs. Update the
end user docs to match the actual value.

Change-Id: Ie11a12f4ee8e5fbb760c177de72f8a3d88c751c5
Story: #2005928
Task: #34270

openstack/magnum,ArchiFleKs/magnum,openstack/magnum,ArchiFleKs/magnum