RFR: 8323660: Serial: Fix header ordering and indentation [v4]

[Kim Barrett]

On Sun, 14 Jan 2024 01:33:45 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

Marked as reviewed by kbarrett (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17398#pullrequestreview-1820153819