[jdk21u-dev] RFR: 8340466: Add description for PassFailJFrame constructors

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 3762ec3978bfe9910929ab22aaf238e9f4c84630

Changes: https://git.openjdk.org/jdk21u-dev/pull/1087/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1087&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340466
  Stats: 153 lines in 1 file changed: 96 ins; 14 del; 43 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1087.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1087/head:pull/1087

PR: https://git.openjdk.org/jdk21u-dev/pull/1087