RFR: Added information on more complex release note options

Wed Aug 9 17:43:30 UTC 2023

On Mon, 7 Aug 2023 16:17:20 GMT, calnan <duke at openjdk.org> wrote:

> Included information on how to set up multiple notes for the same issue or linking multiple issues to the same note, and how to set up notes for backports

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/guide/pull/113#pullrequestreview-1570227447