RFR: 8373427: StructuredTaskScope::join not clear if called with interrupted status set

[Alan Bateman]

Small docs-only clarification to make it clearer that join throws InterruptedException if called with the current thread's interrupted status set. Also make it clear that the exception clears the interrupted status.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/29059/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29059&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373427
  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/29059.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29059/head:pull/29059

PR: https://git.openjdk.org/jdk/pull/29059