Update article.md

Added semicolon

Author: yangsong97

1-js/02-first-steps/17-arrow-functions-basics/article.md

@@ -5,10 +5,10 @@ There's another very simple and concise syntax for creating functions, that's of
 It's called "arrow functions", because it looks like this:
 
 ```js
-let func = (arg1, arg2, ..., argN) => expression
+let func = (arg1, arg2, ..., argN) => expression;
 ```
 
-...This creates a function `func` that accepts arguments `arg1..argN`, then evaluates the `expression` on the right side with their use and returns its result.
+This creates a function `func` that accepts arguments `arg1..argN`, then evaluates the `expression` on the right side with their use and returns its result.
 
 In other words, it's the shorter version of: