[jfx15] RFR: 8252784: Create release notes for JavaFX 15 [v2]

[Johan Vos]

> Fix for JDK-8252784

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  add list of javascript bridge restrictions

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/296/files
  - new: https://git.openjdk.java.net/jfx/pull/296/files/fee979b0..54939604

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=296&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=296&range=00-01

  Stats: 42 lines in 1 file changed: 42 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/296.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/296/head:pull/296

PR: https://git.openjdk.java.net/jfx/pull/296