RFR: Section on backporting [v7]

[Kevin Rushforth]

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

Are you talking about changing the backport relationship of a backport record in JBS for which a fix has already been pushed, but then subsequently backed out? That seems like the wrong thing to do, given that there is in fact a commit in the update release repo with the main bug ID.

I might be missing something, but would it be sufficient to indicate fix-failed in the backport record (for the release where it was later backed out), and then file a REDO bug?

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