[jdk17] RFR: 8269513: Clarify the spec wrt `useOldISOCodes` system property [v2]

[Brian Burkhalter]

On Mon, 28 Jun 2021 18:37:34 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Please review this small doc change to the system property. Accompanying CSR has also been created.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Refined wording.

Looks fine.

-------------

Marked as reviewed by bpb (Reviewer).

PR: https://git.openjdk.java.net/jdk17/pull/163