Included type in SSL certificate documentation

[walkafwalka]

If you specify spec.api.loadBalancer.sslCertificate, but not spec.api.loadBalancer.type, the configuration will be invalid.

[k8s-ci-robot]

Hi @walkafwalka. Thanks for your PR.

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[justinsb]

Thanks @walkafwalka

Travis failures are a temporary thing due to the year rolling over...

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, walkafwalka

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