Add Exemple for instance group tagging

[sergeohl]

I had doc to show how to add tags on aws ASG and node

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[sergeohl]

/assign @justinsb

[chrislovecnm]

A nitpick that you can do in a follow-up PR or someone else can edit. These labels should work in GCE as well now.

[sergeohl]

When I check the godocs (https://godoc.org/k8s.io/kops/pkg/apis/kops#InstanceGroupSpec), there is just mentin of AWS

    CloudLabels map[string]string `json:"cloudLabels,omitempty"```

[chrislovecnm]

I am pretty certain the godoc are out of date :) We are good for now.

[chrislovecnm]

/lgmt

[chrislovecnm]

/ok-to-test

[chrislovecnm]

/lgtm

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