git: openjdk/jdk-sandbox: json: trivial doc fix

[duke]

Changeset: f75c219f
Branch: json
Author:    Naoto Sato <naoto.sato at oracle.com>
Date:      2025-07-10 12:50:26 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/f75c219f21bd1d9282227ad6df83d6631de1b56b

trivial doc fix

! src/java.base/share/classes/java/util/json/JsonString.java