RFR: Section on backporting [v7]

[Jesper Wilhelmsson]

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

I don't think we should change the type of the backed out backport issue. I don't see any benefit in that, just extra work. We aren't trying to hide the fact that the backport was attempted.

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