RFR: Cleanups and fixes [v3]

[Jesper Wilhelmsson]

On Wed, 1 Oct 2025 19:21:12 GMT, Iris Clark <iris at openjdk.org> wrote:

>> I want the focus to be on commonly updated releases, not commonly updated directories.
>
> Ah, sorry about that. I revise my minor tweak to "The intention is to include directories that exist in mainline and other commonly updated releases (post JDK 9)."

Fixed.

-------------

PR Review Comment: https://git.openjdk.org/guide/pull/159#discussion_r2400296949