Fix vscode custom data tag name

[kt0]

I also wanted to add url and description but no data wasn't available from custom-elements.json, I thought about useing docs/components/{component}.md before ## Examples but that's unpredictable and probably a hell to maintain

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[claviska]

Agree. I'd eventually like to move from Docsify to an 11ty site that supports front matter in its markdown files. That will make this easier to do.

Thanks for catching this!