RFR: 8323660: Serial: Fix header ordering and indentation [v2]

[Lei Zaakjyu]

> follow up 8234502.

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

  fix indent

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17398/files
  - new: https://git.openjdk.org/jdk/pull/17398/files/6d423eee..5c9a5e96

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17398&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17398&range=00-01

  Stats: 37 lines in 1 file changed: 0 ins; 3 del; 34 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