RFR: JDK-8302360 Atomic*.compareAndExchange Javadoc unclear [v2]

[Viktor Klang]

> I think the following proposal is very non-invasive and merely draws attention to the fact that "witness value" is a specific term related to the notion of these atomic methods.
> 
> It's a small change which I think provides additional clarity, see JBS for the discussion on the topic.

Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:

  Reverting wording change to AtomicReference compareAndExchange

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12880/files
  - new: https://git.openjdk.org/jdk/pull/12880/files/923d23d0..d6d2e81b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12880&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12880&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12880.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12880/head:pull/12880

PR: https://git.openjdk.org/jdk/pull/12880