RFR: New text about mailing lists [v4]

[Jesper Wilhelmsson]

> 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

-------------

Changes:
  - all: https://git.openjdk.java.net/guide/pull/17/files
  - new: https://git.openjdk.java.net/guide/pull/17/files/2319b7a2..889d4373

Webrevs:
 - full: https://webrevs.openjdk.java.net/guide/17/webrev.03
 - incr: https://webrevs.openjdk.java.net/guide/17/webrev.02-03

  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/guide/pull/17.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/17/head:pull/17

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