[jdk23] RFR: 8335479: JFR: Missing documentation for -XX:StartFlightRecording

[Erik Gahlin]

8335479: JFR: Missing documentation for -XX:StartFlightRecording

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Commit messages:
 - Backport 68ffec9800b798927a050900a2d47000aa18ef30

Changes: https://git.openjdk.org/jdk/pull/20029/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20029&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335479
  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20029.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20029/head:pull/20029

PR: https://git.openjdk.org/jdk/pull/20029