RFR: 8347605: Use spec tag to refer to IEEE 754 standard

[Iris Clark]

On Mon, 13 Jan 2025 17:28:33 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Redo the work done in JDK-8285977 to use the `@spec` tag so that the IEEE floating-point standard gets listed as one of the external specifications.

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23082#pullrequestreview-2547378753