RFR: 8368563: JFR: Improve jfr query help text

[Erik Gahlin]

Could I have review of PR that improves the help text for `jfr query`?

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Fix alignment
 - Initial

Changes: https://git.openjdk.org/jdk/pull/27558/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27558&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368563
  Stats: 18 lines in 2 files changed: 2 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/27558.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27558/head:pull/27558

PR: https://git.openjdk.org/jdk/pull/27558