RFR: 8331507: JFR: Improve example usage in -XX:StartFlightRecording:help

[Erik Gahlin]

Could I have review that changes the the first example for -XX:StartFlightRecording:help. See bug for more details.

Testing: test/jdk/jdk/jfr

Thanks
Erik

-------------

Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/19067/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19067&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331507
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19067.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19067/head:pull/19067

PR: https://git.openjdk.org/jdk/pull/19067