RFR: 8370963: Errors in jpackage jtreg test descriptions

[Alexey Semenyuk]

Fix jpackage jtreg test descriptions. No functional impact

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Commit messages:
 - Cleanup jtreg descriptions
 - Fix jtreg descriptions

Changes: https://git.openjdk.org/jdk/pull/28067/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28067&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370963
  Stats: 29 lines in 13 files changed: 5 ins; 24 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28067.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28067/head:pull/28067

PR: https://git.openjdk.org/jdk/pull/28067