Update iiif_3_0.json

fixing json

Author: glenrobson

schema/iiif_3_0.json

@@ -891,11 +891,9 @@
                         "prev": { "$ref": "#/classes/annotationPageRef" },
                         "first": { "$ref": "#/classes/annotationPageRef" },
                         "last": { "$ref": "#/classes/annotationPageRef" }
-                    },
-                    "required": ["id","type","items"],
-                    "additionalProperties": false
-                }
-            },
+                    }
+                }    
+            ],
             "required": ["id", "type", "items"],
             "additionalProperties": false
         },