RFR: New text about mailing lists [v4]

[Iris Clark]

On Thu, 18 Jun 2020 17:46:43 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:
> 
>   Minor fixes after review

src/mailingLists.md line 11:

> 10: in the [Bylaws](https://openjdk.java.net/bylaws). As a general recommendation we suggest
> 11: to subscribe to [announce](http://mail.openjdk.java.net/mailman/listinfo/announce),
> 12: [discuss](http://mail.openjdk.java.net/mailman/listinfo/discuss), and the `-dev` lists

Consider using "https" instead of "http" for references to mailing lists.

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