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rephrase section describing old JavaScript code

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I felt like this needed a bit if rephrasing.

For example, "But all browsers born in the past 15+ years don’t have any issues" felt a little odd.

After trying to make it more sensible, I felt the same information could be communicated much more simply.
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jacob 2018-08-22 07:19:06 -05:00 • committed by GitHub
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1-js/02-first-steps/01-hello-world/article.md
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@ -61,7 +61,7 @@ Comments before and after scripts.
//--></script>
```
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. We mention it here, because such comments serve as a sign. If you see that somewhere -- that code is probably really old and not worth looking into.
This trick isn't used in modern JavaScript. These comments were used to hide the JavaScript code from old browsers that didn't know about a `<script>` tag. Since browsers born in the last 15 years don't have this issue, this kind of comment can help you identify really old code.
## External scripts