Fix typo in duplicated story warning (#8341)

Fix typo in duplicated story warning

lib/client-api/src/story_store.ts

@@ -190,7 +190,7 @@ export default class StoryStore extends EventEmitter {
         Story with id ${id} already exists in the store!
 
         Perhaps you added the same story twice, or you have a name collision?
-        Story ids need to be unique -- ensure you aren't using the same names modolo url-sanitization.
+        Story ids need to be unique -- ensure you aren't using the same names modulo url-sanitization.
       `);
     }