Fixed typos in article.md

There were some typos in the first line of A semicolon section. (Line 122).  I have proposed a possible fix.

Author: meetsha

1-js/03-code-quality/02-coding-style/article.md

@@ -119,7 +119,7 @@ There are two types of indents:
 
 ### A semicolon
 
-A semicolons should be after each statement. Even if could possibly be skipped.
+A semicolon should be present after each statement. Even if it could be possibly be skipped.
 
 There are languages where a semicolon is truly optional. It's rarely used there.