RFR: Update owners

[Phil Race]

I noticed that code-owners still had the 5 old client mailing lists replaced by
client-libs-dev last year.

Also the code assignments were out of date

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Commit messages:
 - Update owners

Changes: https://git.openjdk.java.net/guide/pull/85/files
 Webrev: https://webrevs.openjdk.java.net/?repo=guide&pr=85&range=00
  Stats: 19 lines in 1 file changed: 0 ins; 13 del; 6 mod
  Patch: https://git.openjdk.java.net/guide/pull/85.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/85/head:pull/85

PR: https://git.openjdk.java.net/guide/pull/85