Add Compound Schema Document to changelog

Author: Relequestual

jsonschema-core.xml

@@ -3924,7 +3924,7 @@ https://example.com/schemas/common#/$defs/count/minimum
                             <t>Rename $recursive* to $dynamic*</t>
                             <t>$dynamicAnchor defines a fragment like $anchor</t>
                             <t>$dynamic* (previously $recursive) no longer use runtime base URI determination</t>
-                            <t></t>
+                            <t>Define Compound Schema Documents (bundle) and processing</t>
                             <t></t>
                             <t></t>
                             <t></t>