[jdk21] RFR: 8294401: Update jfr man page to include recently added features

[Erik Gahlin]

8294401: Update jfr man page to include recently added features

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Commit messages:
 - Backport f60c1f9bc4355f3abf428f9a0f7a65eace5598d0

Changes: https://git.openjdk.org/jdk21/pull/122/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=122&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/jdk21/pull/122.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/122/head:pull/122

PR: https://git.openjdk.org/jdk21/pull/122