RFR: 2138: Backport instructions should include suggested PR comment

[Zhao Song]

On Wed, 10 Jan 2024 21:34:50 GMT, Zhao Song <zsong at openjdk.org> wrote:

> In this patch, if user use the backport command to create a backport, regardless the backport can be created automatically or not, the user will get a suggestion for the pull request body.

Thanks!

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PR Comment: https://git.openjdk.org/skara/pull/1597#issuecomment-1885936630