git: openjdk/jfx26u: master: 8304008: Update README.md and CONTRIBUTING.md for jfx update repos

[Kevin Rushforth]

Changeset: 380cba70
Branch: master
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2026-01-22 13:52:42 +0000
URL:       https://git.openjdk.org/jfx26u/commit/380cba709227330023075ce7ef3d3ef5a59e4a1a

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

Reviewed-by: jvos
Backport-of: 632792d4e7a6399c156df99b1cf69faba476a8c6

! CONTRIBUTING.md
! README.md