modify comment error

[TonyZZhang]

modify comment error

[google-cla]

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tenzen-y]

Thanks!
/lgtm

Also, can you approve CLA?

[TonyZZhang]

ok, I will approve CLA.

[tenzen-y]

/assign @terrytangyuan

[tenzen-y]

@terrytangyuan friendly ping :)