RFR: Section on backporting [v6]

[Jesper Wilhelmsson]

On Wed, 1 Dec 2021 14:03:19 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

> A general remark wrt. backouts:
> One thing I have always been wondering about:
> What to do if a backported issue is backed out?
> For an example see JDK-8274338. It was backported
> to 11.0.14 but then backed out again as JDK-8276943.
> Nevertheless in JBS the original issue is marked as backported
> to 11.0.14.
> Should we advise to remove this link, and change
> the backport issue and the backout issue to
> bugs?
> I think this would make obvious that the issue is NOT
> fixed in the older release (here 11.0.14).

This is an excellent question. I'll add some info on that topic to the section covering backouts.

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PR: https://git.openjdk.java.net/guide/pull/66