docs: Update JSONSchemaViewer.mdx

Author: jy95

testsite/docs/api/JSONSchemaViewer.mdx

@@ -60,6 +60,16 @@ type JSVOptions = {
      * @default undefined
      */
     UnresolvedRefsComponent?: (params: { schema: JSONSchema }) => JSX.Element
+    /**
+     * Defines how deep the schema should be expanded by default
+     * Examples:
+     *  - 0: only the root level is expanded
+     *  - 1: root level and its direct children are expanded
+     *  - Infinity: expand all levels
+     * @default 0
+     * @min 0
+     */
+    defaultExpandDepth?: number
 }
 ```