RFR: 8294401: Update jfr man page to include recently added features

Wed Jul 12 13:05:20 UTC 2023

Could I have a review of changes to the jfr manage.

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/14850/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14850&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294401
  Stats: 193 lines in 1 file changed: 169 ins; 8 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/14850.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14850/head:pull/14850

PR: https://git.openjdk.org/jdk/pull/14850