RFR: update code-owners

[Phil Race]

On Sat, 14 May 2022 23:02:22 GMT, Phil Race <prr at openjdk.org> wrote:

> I just happened to notice the guide still has the old 5 retired client mailing lists instead of the client-libs-dev replacement
> 
> Then I noticed the code area assignments were out of date too.

Accidentally forgot to create a branch - so closed this one and submitted a new one
https://github.com/openjdk/guide/pull/85

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PR: https://git.openjdk.java.net/guide/pull/84