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

[Iris Clark]

On Tue, 9 Jan 2024 23:55:30 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Backporting the document clarification to JDK22

Confirmed that this change corresponds to the changes in main-line and the previously approved CSR.

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Marked as reviewed by iris (Reviewer).

PR Review: https://git.openjdk.org/jdk22/pull/47#pullrequestreview-1812224747