<i18n dev> RFR: 6228794: java.text.ChoiceFormat pattern behavior is not well documented. [v5]

[Justin Lu]

> Please review this PR and associated [CSR](https://bugs.openjdk.org/browse/JDK-8314546) which expands on the `java.text.ChoiceFormat` specification regarding its pattern.
> 
> `j.text.ChoiceFormat` provides an example pattern in the class description, but beyond that it does not specify any well-defined syntax for creating a pattern. In addition, methods related to the pattern String are under-specified.
> 
> The wording for `getLimits()` and `getFormats()` was also adjusted, as there are other ways to set the limits and formats beyond the constructor.
> 
> The pattern syntax may be easier to view -> https://cr.openjdk.org/~jlu/api/java.base/java/text/ChoiceFormat.html

Justin Lu has updated the pull request incrementally with three additional commits since the last revision:

 - Make starting sentence consistent with other Format classes. Improve wording, a choiceFormat does NOT have to be created with only the arrays constructor.
 - Improve throws description for input that takes pattern
 - Make Format definition more consistent with other Format classes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15392/files
  - new: https://git.openjdk.org/jdk/pull/15392/files/e3dafe6e..4103cf9b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15392&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15392&range=03-04

  Stats: 11 lines in 1 file changed: 4 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/15392.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15392/head:pull/15392

PR: https://git.openjdk.org/jdk/pull/15392