RFR: 8318466: Improve spec of NumberFormat's methods with unsupported operations

[Naoto Sato]

On Wed, 1 Nov 2023 21:27:57 GMT, Justin Lu <jlu at openjdk.org> wrote:

> Please review this simple change which refines the specification of some NumberFormat methods (with unsupported operations) to separate the API and implementation specification.

LGTM

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Marked as reviewed by naoto (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16464#pullrequestreview-1710785970