RFR: 8362882: Update SubmissionPublisher() specification to reflect use of ForkJoinPool.asyncCommonPool()

[Alan Bateman]

The changes in JDK-8319447 to improve the performance of delayed task handling updated CompletableFuture and SubmissionPublisher to use the ForkJoinPool commonPool in all cases. These APIs previously created a Thread for each task when parallelism was less than 2. We missed the update to SubmissionPublisher's no-arg constructor in that update.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/26426/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26426&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362882
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26426.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26426/head:pull/26426

PR: https://git.openjdk.org/jdk/pull/26426