Update guides/release/services/services.md

Co-Authored-By: muziejus <[email protected]>

Author: rwjblue

guides/release/services/services.md

@@ -41,7 +41,7 @@ export default class ShoppingCartService extends Service {
 
   add(item) {
     this.items.pushObject(item);
-  };
+  }
 
   remove(item) {
     this.items.removeObject(item);