RFR: 8338398: Trivially fix grammar and typos

[Pavel Rappo]

This PR fixes a few trivial grammar issues and typos in documentation.

The main issue is the use of the word "timeout". To my mind, timeout, a duration, is not the same as deadline, which is a point in time, an instant, which allows "before" and "after". While one can think of timeout as of an event, which can occur, it usually expires, or elapses. An activity can also "time out" (phrasal verb).

I think the proposed change might read better and match wording already used throughout `java.util.concurrent.**`, for example, here:  

* https://github.com/openjdk/jdk/blob/00e6c63cd12e3f92d0c1d007aab4f74915616ffb/src/java.base/share/classes/java/util/concurrent/ExecutorService.java#L211-L223
* https://github.com/openjdk/jdk/blob/fbe4cc96e223882a18c7ff666fe6f68b3fa2cfe4/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedSynchronizer.java#L1019-L1036 

@DougLea, thoughts?

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/20584/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20584&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338398
  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/20584.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20584/head:pull/20584

PR: https://git.openjdk.org/jdk/pull/20584