Fix Custom Objects API example

[jpbalarini]

I was trying to create a namespaced custom object using the provided example without success. I found that the resource that the example provides is missing the spec wrapper.

I was able to create a custom object successfully after changing that. Some reference documentation regarding the custom resource definition:
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.13/#customresourcedefinition-v1beta1-apiextensions-k8s-io

Thanks!

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[jpbalarini]

/assign @yliaog

[micw523]

/lgtm
ref:
https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/

[yliaog]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jpbalarini, yliaog

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