RFR: clarify how to set the affects versions

[David Holmes]

On Thu, 15 Feb 2024 00:04:17 GMT, calnan <duke at openjdk.org> wrote:

> moved together information on how the set the affects version and the meaning of the (Rel)-na and (Rel)-wnf labelss

src/guide/jbs-jdk-bug-system.md line 213:

> 211:   * In addition to the version where the bug was found, take special care to also investigate if the bug affects mainline.
> 212:    * See [Indicating what releases an issue is applicable to](#indicating-what-releases-an-issue-is-applicable-to) for more details
> 213:   * For enhancements the [Affects Version]{.jbs-field} should be empty unless you feel that it is only relevant to a particular release family, and should not go into a future mainline release.

Given that we generally don't apply enhancements to update releases, and that when we do they are usually backports, then this seems such a rare occurrence as to not be worth mentioning. Possibly the only case I can think of that might be classified as an enhancement would be where an update release eventually drops support for something that was already dropped in a future release.

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PR Review Comment: https://git.openjdk.org/guide/pull/119#discussion_r1495309729