RFR: Section on backporting [v7]

[Goetz Lindenmaier]

On Thu, 2 Dec 2021 19:34:09 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Guidance on backporting.
>> Also moved "Backing out a change" to the testing section where I believe it fits better. This section is unchanged.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixes after review

LGTM

Hi, 
sorry, this moved out of my mind.
This seems to be a complicated issue, I don't want to block this PR with it.
Maybe it should be a follow up.
As all the other content is very useful, so we should get it commited.

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Marked as reviewed by goetz (no project role).

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