RFR: Smaller fixes and clarifications

[Iris Clark]

On Tue, 11 Nov 2025 16:04:31 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> Fixed a link
> Split a line to make the second half more prominent
> Added info on how to deal with additional versions for a release note

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/guide/pull/163#pullrequestreview-3449012355