RFR: Section on backporting [v2]

[Stefan Karlsson]

On Tue, 23 Nov 2021 21:39:45 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 reviews

src/index.md line 1500:

> 1498: ## Requesting approvals for backports
> 1499: 
> 1500: In order to be allowed to push a change to one of the OpenJDK Update Release repositories, an approval is required. The [official process for how to request push approval for a backport](https://openjdk.java.net/projects/jdk-updates/approval.html) describes in detail how to work with JBS when requesting approvals. In short, there's a label `jdk<release>u-fix-request` that should be added to the main JBS issue. Also put a motivation as to why the issue needs to be backported as a comment in the main issue. Once the label and motivation has been added, wait for the maintainers of the release to approve your request.

"wait for the maintainers of the release to approve your request" - Should this section describe that they do so by adding the label `jdk<release>u-fix-yes`?

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