git: openjdk/jdk-sandbox: json: seen -> untypedObjs. add circ ref example

[duke]

Changeset: 9aa5e7af
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-01-10 12:01:26 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/9aa5e7af0cdc441cc7b03ae6b784078ce80638c9

seen -> untypedObjs. add circ ref example

! src/java.base/share/classes/java/util/json/Json.java
! src/java.base/share/classes/java/util/json/JsonArrayImpl.java
! src/java.base/share/classes/java/util/json/JsonGenerator.java
! src/java.base/share/classes/java/util/json/JsonObjectImpl.java