[jfx21u] RFR: 8317842: Create release notes for JavaFX 21.0.1

[Kevin Rushforth]

Release notes for JavaFX 21.0.1.

Notes to reviewers:

I used the following filter to pick the issues:

https://bugs.openjdk.org/issues/?filter=44663

The original filter, with the backport IDs, is here:

https://bugs.openjdk.org/issues/?filter=44662

As usual, I excluded test bugs, cleanup bugs, etc. I manually excludes 4 additional bugs, one of which was a README change (does not affect the product), and the other three were introduced and fixed in the same release.

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Commit messages:
 - 8317842: Create release notes for JavaFX 21.0.1

Changes: https://git.openjdk.org/jfx21u/pull/19/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=19&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317842
  Stats: 18 lines in 1 file changed: 18 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx21u/pull/19.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/19/head:pull/19

PR: https://git.openjdk.org/jfx21u/pull/19