<i18n dev> RFR: 8329222: java.text.NumberFormat (and subclasses) spec updates [v2]

[Justin Lu]

> Please review this PR which is a large spec reformatting for _java.text.NumberFormat_ and related subclasses, specifically DecimalFormat and CompactNumberFormat.
> 
> The motivation for this change was the difficulty of readability for these classes. This PR consists of changes such as better separating the text into sections with headers, advising to skip the pattern related sections if not needed, and general wording improvements.
> 
> To help with reviewing I have attached a [specdiff](https://cr.openjdk.org/~jlu/JDK-8329222/java.base/java/text/package-summary.html) as well as the built docs: [nFmt](https://cr.openjdk.org/~jlu/api/java.base/java/text/NumberFormat.html), [dFmt](https://cr.openjdk.org/~jlu/api/java.base/java/text/DecimalFormat.html), and [cnFmt](https://cr.openjdk.org/~jlu/api/java.base/java/text/CompactNumberFormat.html);
> 
> I will update the CSR once the wording is finalized.

Justin Lu has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - merge master and add setStrict() to nFmt class spec
 - implement suggestions from dFmt review
 - implement suggestions from cnFmt review
 - implement suggestions from nFmt review
 - init

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Changes: https://git.openjdk.org/jdk/pull/18731/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18731&range=01
  Stats: 597 lines in 3 files changed: 233 ins; 204 del; 160 mod
  Patch: https://git.openjdk.org/jdk/pull/18731.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18731/head:pull/18731

PR: https://git.openjdk.org/jdk/pull/18731