RFR: 8322812: Manpage for jcmd is missing JFR.view command

[Erik Gahlin]

Could I have a review of a change to the jcmd man page? A typo was also fixed for JFR.start.

Testing: tier1

Thanks
Erik

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Commit messages:
 - Don't touch version
 - Review feedback
 - Initial

Changes: https://git.openjdk.org/jdk/pull/19942/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19942&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322812
  Stats: 50 lines in 1 file changed: 49 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19942.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19942/head:pull/19942

PR: https://git.openjdk.org/jdk/pull/19942