[lworld+fp16] RFR: 8337605: Update description of constants in Float16

[Raffaello Giulietti]

On Thu, 1 Aug 2024 00:42:02 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Align wording or Float16 constants more closely with wording used in Float/Double, add links to corresponding Float/Double constants.

LGTM

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Marked as reviewed by rgiulietti (no project role).

PR Review: https://git.openjdk.org/valhalla/pull/1191#pullrequestreview-2221499225