RFR: Section on backporting [v2]

[Jesper Wilhelmsson]

On Tue, 30 Nov 2021 13:18:09 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> src/index.md line 1504:
>> 
>>> 1502: ## Using the Skara tooling to help with backports
>>> 1503: 
>>> 1504: The Skara project developed support for backports. [The official Skara documentation](https://wiki.openjdk.java.net/display/SKARA/Backports) describes in detail how to work with the tooling to create backport PRs on GitHub or using the CLI tools. As described in the documentation, the [`/backport`](https://wiki.openjdk.java.net/display/SKARA/Commit+Commands#CommitCommands-/backport) command can be used to create the backport PR. If a backport PR is manually created, set the title to `Backport <original commit hash>`.
>> 
>> Suggestion:
>> 
>> The Skara tooling includes support for backports. [The official Skara documentation](https://wiki.openjdk.java.net/display/SKARA/Backports) describes in detail how to work with the tooling to create backport PRs on GitHub or using the CLI tools. As described in the documentation, the [`/backport`](https://wiki.openjdk.java.net/display/SKARA/Commit+Commands#CommitCommands-/backport) command can be used on a commit (not a PR!) to create the backport PR. If a backport PR is manually created, set the title to `Backport <original commit hash>`.
>
> You did not like these suggestions? It has happened more than once that users try to use `/backport` on a PR, since commit commands (or even comments in general!) is not widely known about. I think at least that should be made more clear.

These changes has been included in the current version. Thank you for your review and these suggestions!

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