[jdk24u] RFR: 8350260: Improve HTML instruction formatting in PassFailJFrame

[Alexey Ivanov]

This pull request contains a backport of commit [014701a0](https://github.com/openjdk/jdk/commit/014701a09b23d21f57edb5b085820532804475bd) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Alexey Ivanov on 19 Feb 2025 and was reviewed by Alexander Zuev, Alexander Zvegintsev and Abhishek Kumar.

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Commit messages:
 - Backport 014701a09b23d21f57edb5b085820532804475bd

Changes: https://git.openjdk.org/jdk24u/pull/99/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=99&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350260
  Stats: 7 lines in 1 file changed: 2 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk24u/pull/99.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/99/head:pull/99

PR: https://git.openjdk.org/jdk24u/pull/99