RFR: Section on backporting

[Jesper Wilhelmsson]

On Thu, 2 Dec 2021 13:32:56 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> A minimum action here would be to also remove the backported-by-link and add a relates-to-link instead.

I have left JDK-8276785 in this somewhat bad state for now to keep it as an example. Once we have some kind of agreement on how exactly to handle situations like this I'll clean it up.

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