Integrated: Update mailman address

[Alexey Ivanov]

On Fri, 1 Aug 2025 16:50:33 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> Recently, a person sent an email to `mailman-at-openjdk.org` to change the email address as mentioned in the Guide, yet the email was rejected. The rejection email contained another address `mailman-owner-at-openjdk.org` that worked well. Therefore, I suggest updating the mail-man address in the Guide.
> 
> I also replaced “discussions _around_” with “discussions _about_”. This is how mailing lists are described on the page that lists all available OpenJDK mailing lists.

This pull request has now been integrated.

Changeset: 5fdbea70
Author:    Alexey Ivanov <aivanov at openjdk.org>
Committer: Jesper Wilhelmsson <jwilhelm at openjdk.org>
URL:       https://git.openjdk.org/guide/commit/5fdbea70811e5bbf2698609822f38252e2b7063b
Stats:     4 lines in 1 file changed: 0 ins; 0 del; 4 mod

Update mailman address

Reviewed-by: iris

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PR: https://git.openjdk.org/guide/pull/154