RFR: 8324089: Fix typo in the manual page for "jcmd" (man jcmd)

[Erik Gahlin]

Could I have a review of a typo for JFR.start and JFR.dump?

Testing: tier1

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/20003/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20003&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324089
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20003.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20003/head:pull/20003

PR: https://git.openjdk.org/jdk/pull/20003