[jdk22] RFR: 8320919: Clarify Locale related system properties

[Naoto Sato]

Backporting the document clarification to JDK22

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Commit messages:
 - Backport 376051a9be95e0e4acf3c59d0eba3e9ef8727d79

Changes: https://git.openjdk.org/jdk22/pull/47/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk22&pr=47&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320919
  Stats: 81 lines in 1 file changed: 71 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk22/pull/47.diff
  Fetch: git fetch https://git.openjdk.org/jdk22.git pull/47/head:pull/47

PR: https://git.openjdk.org/jdk22/pull/47