RFR: 8358618: UnsupportedOperationException constructors javadoc is not clear [v4]

[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:

  revert changes to RuntimeException.java
  Wrap lines at 80 chars

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26533/files
  - new: https://git.openjdk.org/jdk/pull/26533/files/965d5263..c11e9dbb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26533&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26533&range=02-03

  Stats: 14 lines in 2 files changed: 1 ins; 0 del; 13 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