RFR: 8358618: UnsupportedOperationException no-args constructor javadoc is not clear [v3]

[Nizar Benalla]

> Please review this patch that extends the javadoc of `UnsupportedOperationException` no-arg constructor, to clear up that the detail message is null.

Nizar Benalla has updated the pull request incrementally with one additional commit since the last revision:

  Feedback from Alexey.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26533/files
  - new: https://git.openjdk.org/jdk/pull/26533/files/f1a2e8c4..965d5263

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26533&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26533&range=01-02

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26533.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26533/head:pull/26533

PR: https://git.openjdk.org/jdk/pull/26533