RFR: 8355515: Clarify the purpose of forcePass() and forceFail() methods [v2]

[Manukumar V S]

> Clarified the purpose of forcePass() and forceFail() methods and recommended usage of these methods.
> 
> forcePass() contained an incorrect sample; it's addressed by [JDK-8355441](https://bugs.openjdk.org/browse/JDK-8355441).
> 
> The description of forceFail() has been expanded, too.
> 
> 
> A new section in the description of the PassFailJFrame added to describe forcePass() and forceFail().

Manukumar V S has updated the pull request incrementally with one additional commit since the last revision:

  Review comments fixed : Formatting changes, wordings changed

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25091/files
  - new: https://git.openjdk.org/jdk/pull/25091/files/68f72e46..9f0a6321

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25091&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25091&range=00-01

  Stats: 15 lines in 1 file changed: 3 ins; 1 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/25091.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25091/head:pull/25091

PR: https://git.openjdk.org/jdk/pull/25091