git: openjdk/jfx24u: master: 8304008: Update README.md and CONTRIBUTING.md for jfx update repos

[Kevin Rushforth]

Changeset: 1f628a9d
Branch: master
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2025-01-22 19:22:58 +0000
URL:       https://git.openjdk.org/jfx24u/commit/1f628a9d3f87f673e97486961d6b9cad3e267ce2

8304008: Update README.md and CONTRIBUTING.md for jfx update repos

Reviewed-by: jvos
Backport-of: 632792d4e7a6399c156df99b1cf69faba476a8c6

! CONTRIBUTING.md
! README.md