RFR: New text about mailing lists

[Jesper Wilhelmsson]

On Wed, 10 Jun 2020 23:30:21 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> The last three types of lists, used for expert groups, could use a better explanation. I'm not sure how these types of
> lists are used though.

Thanks for the reviews!

David, I've used most of your wording for the list descriptions. I'll ask Joe to take a look at the CSR description.

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PR: https://git.openjdk.java.net/guide/pull/17