RFR: 8310033: Clarify return value of Java Time compareTo methods [v8]

[Roger Riggs]

> In java.time packages, clarify timeline order javadoc to mention "before" and "after" in the value of the `compareTo` method return values. 
> Add javadoc @see tags to isBefore and isAfter methods
> 
> Replace use of "negative" and positive with "less than zero" and "greater than zero" in javadoc @return
> The term "positive" is ambiguous, zero is considered positive and indicates equality.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Corrected descriptions with respect to chronology and the concrete temporary type.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14479/files
  - new: https://git.openjdk.org/jdk/pull/14479/files/1d39e2d4..1f7ba75d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14479&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14479&range=06-07

  Stats: 10 lines in 4 files changed: 3 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/14479.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14479/head:pull/14479

PR: https://git.openjdk.org/jdk/pull/14479