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

[Lei Zaakjyu]

> follow up 8234502.

Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:

  fix

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/17398/files
  - new: https://git.openjdk.org/jdk/pull/17398/files/ed54e312..c0e47a0c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17398&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17398&range=02-03

  Stats: 13 lines in 1 file changed: 0 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/17398.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17398/head:pull/17398

PR: https://git.openjdk.org/jdk/pull/17398