Clarifying text in `make help` output on how to list variables for e.g. JTREG='...'.
------------- Commit messages: - 8326831 Clarify test harness control variables in make help Changes: https://git.openjdk.org/jdk/pull/18028/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18028&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8326831 Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/18028.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18028/head:pull/18028 PR: https://git.openjdk.org/jdk/pull/18028
