Update VirtualMachineReplicaSet status and guarantee descriptions
Update VirtualMachineReplicaSet status and guarantee descriptions

Clarify, that the VirtualMachineReplicaSet, does not guarantee that
there will ever only be the amount of specified replicas in the cluster.

Add description of the readyReplicas status field.

Signed-off-by: Roman Mohr <6da0130c5aeef94e5bbaabadbf8017270be25c64@redhat.com>

davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,fabiand/kubevirt,rmohr/kubevirt,fabiand/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,rmohr/kubevirt