RFR: 8341923: java.util.Locale class specification improvements

[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. Alternatively the diffs can be viewed on the API diff link attached on the CSR.

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Commit messages:
 - remove the manual dashes
 - init

Changes: https://git.openjdk.org/jdk/pull/22192/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22192&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341923
  Stats: 298 lines in 1 file changed: 101 ins; 87 del; 110 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