Update testing documentation for ValueClassPlugin jtreg option.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Remove trailing spaces. - JDK-8385601 [lworld] Update testing documentation for ValueClassPlugin jtreg option Changes: https://git.openjdk.org/valhalla/pull/2485/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2485&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8385601 Stats: 63 lines in 2 files changed: 63 ins; 0 del; 0 mod Patch: https://git.openjdk.org/valhalla/pull/2485.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2485/head:pull/2485 PR: https://git.openjdk.org/valhalla/pull/2485
