RFR: 8359919: Minor java.util.concurrent doc improvements [v17]

[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 incrementally with 20 additional commits since the last revision:

 - Merge remote-tracking branch 'refs/remotes/origin/JDK-8359919' into JDK-8359919
 - Add JDK-6663476
 - Add JDK-6663476
 - 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
 - ... and 10 more: https://git.openjdk.org/jdk/compare/153b2b78...533304c0

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25880/files
  - new: https://git.openjdk.org/jdk/pull/25880/files/153b2b78..533304c0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25880&range=16
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25880&range=15-16

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 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