git: openjdk/jdk-sandbox: json: Drop outdated comment in Utils.codeUnit

[duke]

Changeset: f400817c
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-07-01 11:45:45 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/f400817cd60c2c25e5b5ea415c5d77139d605209

Drop outdated comment in Utils.codeUnit

! src/java.base/share/classes/jdk/internal/util/json/Utils.java