KEP-1591: Fix default values for MaxUnavailable and MaxSurge

[renan]

The implementation defines the default value for MaxSurge being 0, as to
preserve the current behavior of rolling updates in DaemonSets. Also,
for MaxUnavailable, the rounding is up.

This change is just a copy-paste of the docblock defined in the types.go
file.

See:

• https://github.com/kubernetes/kubernetes/blob/10a3cc815bea73f78f7126cab5df95233da96e1b/pkg/apis/apps/types.go
• https://github.com/kubernetes/kubernetes/blob/10a3cc815bea73f78f7126cab5df95233da96e1b/pkg/apis/apps/v1/defaults.go#L87-L91

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/lifecycle stale

[renan]

/remove-lifecycle stale

[soltysh]

/ok-to-test
/lgtm
/approve
Thanks for updating these :)

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: renan, soltysh

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