RFR: 8359919: Minor java.util.concurrent doc improvements [v16]

[Doug Lea]

> This collects miscellaneous open issues that can be resolved with documentation updates; each indicated by adding JDK issue numbers

Doug Lea has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 21 additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8359919
 - Merge branch 'openjdk:master' into JDK-8359919
 - Add JDK-8137156
 - Add JDK-6526284 doc update
 - Add JDK-6625724 as docfix
 - Add JDK-6714849 doc update
 - Address review comments; add JDK-8172177
 - Fix ARFU type; add JDK-7176957
 - Address review comments; add JDK-6374942
 - Adding JDK-8333172 to doc improvements
 - ... and 11 more: https://git.openjdk.org/jdk/compare/81956fc0...153b2b78

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25880/files
  - new: https://git.openjdk.org/jdk/pull/25880/files/944ddab2..153b2b78

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25880&range=15
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25880&range=14-15

  Stats: 2645 lines in 173 files changed: 867 ins; 519 del; 1259 mod
  Patch: https://git.openjdk.org/jdk/pull/25880.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25880/head:pull/25880

PR: https://git.openjdk.org/jdk/pull/25880