RFR: 8370071: Clarify jcmd Thread.print help message [v3]

[Sean Coffey]

> Simple tweak to jcmd Thread.print help message
> 
> jdk_svc test group ran and green

Sean Coffey has updated the pull request incrementally with one additional commit since the last revision:

  Further help message tweaks

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27861/files
  - new: https://git.openjdk.org/jdk/pull/27861/files/4d2e42aa..1d688320

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27861&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27861&range=01-02

  Stats: 7 lines in 2 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/27861.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27861/head:pull/27861

PR: https://git.openjdk.org/jdk/pull/27861