git: openjdk/jdk-sandbox: json: toString() description clarification

[duke]

Changeset: e8223131
Branch: json
Author:    Naoto Sato <naoto.sato at oracle.com>
Date:      2025-02-28 14:42:42 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/e8223131dfc70828572a703f967402230fed8306

toString() description clarification

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