[jdk23u] RFR: 8340785: Update description of PassFailJFrame and samples

[Alexey Ivanov]

This pull request contains a backport of commit [5063494f](https://github.com/openjdk/jdk/commit/5063494f5b0859a396b4e41096793c777d4650b8) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Alexey Ivanov on 2 Oct 2024 and was reviewed by Phil Race.

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Commit messages:
 - Backport 5063494f5b0859a396b4e41096793c777d4650b8

Changes: https://git.openjdk.org/jdk23u/pull/173/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=173&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340785
  Stats: 159 lines in 1 file changed: 126 ins; 0 del; 33 mod
  Patch: https://git.openjdk.org/jdk23u/pull/173.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/173/head:pull/173

PR: https://git.openjdk.org/jdk23u/pull/173