Fix typos in questions 67

Author: danah-kim

README.md

@@ -2086,11 +2086,11 @@ The `Dog` class receives two arguments, `name` since it extends `Animal`, and `s
 
 ---
 
-###### 67. With which constructor can we successfully extend the `Dog` class?
+###### 67. What's the output?
 
 ```javascript
 // index.js
-console.log('running index.js);
+console.log('running index.js');
 import { sum } from './sum.js';
 console.log(sum(1, 2));