fix context sentences in YAML to ensure vocab emphasis

docs/howtostudykorean/unit-1/05-tenses.md

@@ -436,7 +436,7 @@ vocabulary:
       examples:
         - ko: 우리 집은 너무 **멀어요**
           en: Our home is very **far**
-        - ko: 저는 먼 병원에 갔어요
+        - ko: 저는 **먼** 병원에 갔어요
           en: I went to a **far away** hospital (a hospital that is **far away**)
 
     - ko: 마르다