RFR: 8323660: Serial: Fix header ordering and indentation [v3]

[Lei Zaakjyu]

On Fri, 12 Jan 2024 15:26:34 GMT, Lei Zaakjyu <duke at openjdk.org> wrote:

>> follow up 8234502.
>
> Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix

thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/17398#issuecomment-1890259324