<i18n dev> RFR: 8351017: ChronoUnit.MONTHS.between() not giving correct result when date is in February

[Naoto Sato]

Clarifying the explanation for `TemporalUnit.between()`. There is already an example for the `HOURS` case where the minutes are not enough to make a full hour. Explaining how smaller units contribute to determining the whole number, along with an explicit `MONTHS` example, which was the case reported by the bug submitter, will help users.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/23937/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23937&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351017
  Stats: 9 lines in 1 file changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23937.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23937/head:pull/23937

PR: https://git.openjdk.org/jdk/pull/23937