minor fixes

1-js/02-first-steps/02-structure/article.md

@@ -58,29 +58,29 @@ If you're curious to see a concrete example of such an error, check this code ou
 ```js run
 alert("Hello");
 
-["World"].forEach(alert);
+[1, 2].forEach(alert);
 ```
 
-No need to think about the meaning of the brackets `[]` and `forEach` yet. We'll study them later. For now, just remember the result of running the code: it shows `Hello`, then `World`.
+No need to think about the meaning of the brackets `[]` and `forEach` yet. We'll study them later. For now, just remember the result of running the code: it shows `Hello`, then `1`, then `2`.
 
 Now let's remove the semicolon after the `alert`:
 
 ```js run no-beautify
 alert("Hello")
 
-["World"].forEach(alert);
+[1, 2].forEach(alert);
 ```
 
 The difference compared to the code above is only one character: the semicolon at the end of the first line is gone.
 
-If we run this code, only the first `Hello` shows. There are no numbers any more.
+If we run this code, only the first `Hello` shows (and then you may see the error, but it may also be hidden). There are no numbers any more.
 
 The difference is because JavaScript does not assume a semicolon before square brackets `[...]`. And, as there's no semicolon, the code in the first example is treated as a single statement. 
 
 Here's how the engine sees it:
 
 ```js run no-beautify
-alert("Hello")["World"].forEach(alert)
+alert("Hello")[1, 2].forEach(alert)
 ```
 
 Looks weird, right? Such merging in this case is just wrong. We need to put a semicolon after `alert` for the code to work correctly.