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

Fri Sep 4 11:54:25 UTC 2020

On Fri, 4 Sep 2020 09:23:52 GMT, Johan Vos <jvos at openjdk.org> wrote:

> Fix for JDK-8252784

Looks fine. Did you want to add a note about the additional Javascript bridge restrictions, similar to [this
note](https://github.com/openjdk/jfx/blob/331a39be016a284e5495c73726e7b58e7769a75e/doc-files/release-notes-14.0.1.md#list-of-security-fixes)
that was done for 14.0.1? Either way is fine with me.

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Marked as reviewed by kcr (Lead).

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