Fix a typo in the Note type

Author: Matchlighter

index.js

@@ -318,7 +318,7 @@ module.exports = {
         lang: { type: 'string' },
         subject: { type: 'string' },
         text: { type: 'string' },
-        attribution: { $ref: '/#definitions/Attribution' }
+        attribution: { $ref: '#/definitions/Attribution' }
       }
     },
     OnlineAccount: {
@@ -832,4 +832,4 @@ module.exports = {
       }
     }
   }
-};
+};