RFR: New text about mailing lists [v3]

[Iris Clark]

On Fri, 12 Jun 2020 01:52:47 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.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rephrased name-suffix part

Your descriptions look good.

I'm wondering if subscription recommendations should be made for those new to OpenJDK?  Whenever I'm asked, my response
is usually announce, discuss, and the "-dev" list(s?) covering the explicit area of interest.

Random note:  Per the Bylaws, OpenJDK mailing list subscribers are defined as "Participants"
(https://openjdk.java.net/bylaws#participant).

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Marked as reviewed by iris (Reviewer).

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