Adds a section for button events and clarifies the existing sections. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).
------------- Commit messages: - Initial commit Changes: https://git.openjdk.org/jfx/pull/2238/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2238&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8389551 Stats: 122 lines in 2 files changed: 27 ins; 1 del; 94 mod Patch: https://git.openjdk.org/jfx/pull/2238.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/2238/head:pull/2238 PR: https://git.openjdk.org/jfx/pull/2238
