Fix some typos

Author: K-Sato1995

Diff for: 1-js/03-code-quality/03-comments/article.md

@@ -18,7 +18,7 @@ complex;
 code;
 ```
 
-But in good code the amount of such "explanatory" comments should be minimal. Seriously, code should be easy to understand without them.
+But in good code, the amount of such "explanatory" comments should be minimal. Seriously, the code should be easy to understand without them.
 
 There's a great rule about that: "if the code is so unclear that it requires a comment, then maybe it should be rewritten instead".