RFR: Section on backporting [v2]

[Jesper Wilhelmsson]

On Wed, 24 Nov 2021 07:59:19 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> 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`?

Yes. Thank you for reviewing! Added a sentence with the label.

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