fix typo: missing double-quote on HTML example

[Bellisario]

I noticed on the website there is this small typo on the "Lists" example.

The live demo seems not to be affected by this issue.

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Name	Status	Preview	Comments	Updated
arrow-js	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 12, 2023 at 7:23PM (UTC)

[justin-schroeder]

Thank you ❤️