Add KVM Auto Enable-Disable Hosts docs (#308)

* Add KVM Auto Enable-Disable Hosts docs

* Address review comments

* Update source/adminguide/hosts.rst

Co-authored-by: Andrija Panic <45762285+andrijapanicsb@users.noreply.github.com>

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Co-authored-by: Andrija Panic <45762285+andrijapanicsb@users.noreply.github.com>
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