[jfx21u] RFR: 8318708: FX: Update copyright year in docs, readme files to 2024

[Ambarish Rapte]

A clean backport to jfx21u, to update copyright year in doc files.

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

Commit messages:
 - update cpr-year in docs to 2024

Changes: https://git.openjdk.org/jfx21u/pull/36/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=36&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318708
  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx21u/pull/36.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/36/head:pull/36

PR: https://git.openjdk.org/jfx21u/pull/36