yaml referential and lesson 10 quiz

docs/howtostudykorean/unit-1/11-time.md

@@ -265,7 +265,7 @@ vocabulary:
 
     - ko: 개월
       audio: https://www.howtostudykorean.com/wp-content/uploads/2015/11/Lesson11v14.mp3
-      en: month
+      en: month (counter)
       notes: |
         <p>When counting months, you can either use 달 or 개월. When using 달, you must use the pure Korean numbers, and when using 개월, you must use the Sino-Korean numbers. There is no difference in meaning, and both are used frequently</p>
       examples: