RFR: 8341923: java.util.Locale class specification improvements [v2]

[Justin Lu]

> Please review this PR and corresponding CSR which includes a wide range of specification improvements for java.util.Locale. See the CSR for further detail. Other changes/suggestions are welcomed to be included as part of this change.
> 
> APIDiff: https://cr.openjdk.org/~jlu/8341923_apidiff/java.base/java/util/Locale.html
> Javadoc: https://cr.openjdk.org/~jlu/api/java.base/java/util/Locale.html

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  address Chen's review; make other similar changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22192/files
  - new: https://git.openjdk.org/jdk/pull/22192/files/6b2eff66..6b5b5cd0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22192&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22192&range=00-01

  Stats: 53 lines in 1 file changed: 5 ins; 6 del; 42 mod
  Patch: https://git.openjdk.org/jdk/pull/22192.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22192/head:pull/22192

PR: https://git.openjdk.org/jdk/pull/22192