RFR: 8359919: Minor java.util.concurrent doc improvements [v10]

[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 one additional commit since the last revision:

  Fix ARFU type; add JDK-7176957

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25880/files
  - new: https://git.openjdk.org/jdk/pull/25880/files/044d8dcd..26d96b88

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25880&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25880&range=08-09

  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 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