Corrected a missing closing quote in the HBox JavaDoc example, ensuring it's properly formatted.
------------- Commit messages: - 8370912: Formatting error on JavaDoc because of missing quotation mark. Changes: https://git.openjdk.org/jfx/pull/1956/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1956&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370912 Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jfx/pull/1956.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1956/head:pull/1956 PR: https://git.openjdk.org/jfx/pull/1956
