[www] Tutorial: Highlight closing tag (#3925)
[www] Tutorial: Highlight closing tag (#3925)

* Highlight closing tag

There are two additions to the code, however only the opening div is highlighted and not its closing tag.

* Made changes suggested by Yisela

@yisela, I changed this! It took a while for me to figure out, which means that most beginners would also have trouble figuring it out, haha. Thanks for noticing and helping Gatsby improve!!!

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