virsh: Enhance documentation of cpu-models command
virsh: Enhance documentation of cpu-models command

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>
Reviewed-by: Collin Walling <6a8456d624ba23d3de7a39e51739b800eab4ccb7@linux.ibm.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Reviewed-by: Kashyap Chamarthy <005b99b234026d47e167244b248f0ff319fdaf16@redhat.com>

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