typo fix in logging number of gRPC workers

[zyxue]

just typo fix.

[seldondev]

Hi @zyxue. Thanks for your PR.

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[ukclivecox]

@zyxue looks good - will run usual tests

[axsaucedo]

NIce one
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

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