Fix typo

Author: snazbala

1-js/02-first-steps/01-hello-world/article.md

@@ -63,7 +63,7 @@ Comments before and after scripts.
     //--></script>
     ```
 
-    These comments were supposed to hide the code from an old browser that did't know about a `<script>` tag. But all browsers born in the past 15+ years don't have any issues. It is only mentioned here, because it serves as a sign. If you see that somewhere -- that code is probably really old and not worth looking into.
+    These comments were supposed to hide the code from an old browser that didn't know about a `<script>` tag. But all browsers born in the past 15+ years don't have any issues. It is only mentioned here, because it serves as a sign. If you see that somewhere -- that code is probably really old and not worth looking into.
 
 
 ## External scripts