Remove ChangeBatch from spec

[michaelhtm]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

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This pull-request has been approved by: michaelhtm

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[ack-prow]

@michaelhtm: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
route53-verify-attribution	a6e024d	link	false	/test route53-verify-attribution

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