RFR: Clarified that for enhancements the affects version should normally be empty [v3]

[Jesper Wilhelmsson]

On Thu, 5 Oct 2023 23:25:57 GMT, calnan <duke at openjdk.org> wrote:

>> Unlike for bugs, for enhancements the affectsversion is less relevant as vast majority will be fixed in a future release and will not be backported. There are situations where it is relevant, if the code is only in an LTS release for example.
>
> calnan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjusted reference to mainline

Marked as reviewed by jwilhelm (Lead).

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PR Review: https://git.openjdk.org/guide/pull/115#pullrequestreview-1664936413