RFR: 8323241: jcmd manpage should use lists for argument lists

[David Holmes]

Trivial fix to the formatting of "argument" lists for a few sub-commands.
Thanks

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Commit messages:
 - 8323241: jcmd manpage should use lists for argument lists

Changes: https://git.openjdk.org/jdk/pull/17318/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17318&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323241
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17318.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17318/head:pull/17318

PR: https://git.openjdk.org/jdk/pull/17318